7th Time Loop

7th Time Loop: The Villainess Enjoys a Carefree Life Married to Her Worst Enemy!
First light novel volume cover
ループ7回目の悪役令嬢は、元敵国で自由気ままな花嫁生活を満喫する (Loop 7-kaime no Akuyaku Reijō wa, Moto Tekikoku de Jiyū Kimamana Hanayome Seikatsu o Mankitsu Suru)
Genre	Fantasy Romance
Novel series
Written by	Touko Amekawa
Published by	Shōsetsuka ni Narō
Original run	February 7, 2020 – present
Light novel
Written by	Touko Amekawa
Illustrated by	Wan Hachipisu
Published by	Overlap
English publisher	NA: Seven Seas Entertainment
Imprint	Overlap Novels f
Demographic	Female
Original run	October 25, 2020 – present
Volumes	6
Manga
Written by	Touko Amekawa
Illustrated by	Hinoki Kino
Published by	Overlap
English publisher	NA: Seven Seas Entertainment
Magazine	Comic Gardo
Demographic	Josei
Original run	December 4, 2020 – present
Volumes	6
Anime television series
Directed by	Kazuya Iwata
Written by	Touko Machida
Music by	Satoshi Hōno Ryūnosuke Kasai
Studio	Studio Kai Hornets
Licensed by	Crunchyroll SA/SEA: Muse Communication
Original network	AT-X, Tokyo MX, BS11
Original run	January 7, 2024 – March 24, 2024
Episodes	12

7th Time Loop: The Villainess Enjoys a Carefree Life Married to Her Worst Enemy! (Japanese: ループ7回目の悪役令嬢は、元敵国で自由気ままな花嫁生活を満喫する, Hepburn: Loop 7-kaime no Akuyaku Reijō wa, Moto Tekikoku de Jiyū Kimamana Hanayome Seikatsu o Mankitsu Suru) is a Japanese light novel series written by Touko Amekawa. The series originated on the Shōsetsuka ni Narō website in February 2020, before being published in print with illustrations by Wan Hachipisu by Overlap beginning in October 2020. As of December 2023, six volumes have been released. A manga adaptation with illustrations by Hinoki Kino began serialization on the Comic Gardo website in December 2020. As of February 2024, the series' individual chapters have been collected into six volumes. An anime television series adaptation produced by Studio Kai and Hornets aired from January to March 2024.

Premise

Rishe Weitzner has had her engagement to the crown prince annulled, but this is the seventh time it's happened; she's stuck within a time loop, where no matter the job she takes or location, she always ends up dead at 20, five years after the annulment. This time she catches the eye of Prince Arnold of the neighboring Galkhein Kingdom, which was the source of a world war, pestilence, resource depletion, and even direct murder in all her previous loops.

Rishe accepts his proposal of marriage on the condition she doesn't have to perform royal duties, and gets to loaf around; also helps Arnold, as she fulfills his father's request to "technically" take a foreign fiancée/hostage. However, she soon starts using all her past life skills to help out the people of the Galkhein Kingdom and sees Arnold is not the same cold person as in her 6th loop; making Rishe wonder what made Arnold's heart grow cold.

Characters

Main characters

Rishe Irmgard Weitzner (リーシェ・イルムガルド・ヴェルツナー, Rīshe Irumugarudo Verutsunā)

Voiced by: Ikumi Hasegawa

Rishe was a political pawn of her parents, who disowned her when the engagement was annulled. However, she found self-confidence thanks to her various jobs in multiple repeats; being a merchant, herbalist, scholar, maid, hunter and knight. Exasperated with her efforts to live a good life being made futile by the Galkhein Kingdom's actions, Rishe decides to take advantage of Arnold's proposal in order to have a lazy life.

Arnold Hein (アルノルト・ハイン, Arunoruto Hain)

Voiced by: Nobunaga Shimazaki

Crown Prince of the Galkhein Kingdom. In the sixth loop, Rishe was killed by him while posing as a male knight. In the seventh loop however, he conveys kind but solemn personality on his early appearances. He falls in love with Rishe and is constantly amazed by her beauty, knight prowess and other skills; finding her interesting.

Supporting characters

Kaine Tully (ケイン・タリー, Kein Tarī)

Voiced by: Shinnosuke Tachibana

The president of Aria Trading Company, who picked up Rishe on her first loop. While a trickster willing to stick others with his invoices, he cares very much for his little sister Aria.

Michel Hévin (ミシェル・エヴァン, Misheru Evan)

Voiced by: Daisuke Ono

Kyle Morgan Cleverly (カイル・モーガン・クレヴァリー, Kairu Mōgan Kurevarī)

Voiced by: Katsumi Fukuhara

Galkhein Kingdom

Theodore Auguste Hein (テオドール・オーギュスト・ハイン, Teodōru Ōgyusuto Hain)

Voiced by: Mariya Ise

Arnold's younger brother. He sees Arnold as a monster for his ruthlessness and tries to help Rishe escape; not understanding their situations.

Oliver Laurenz Friedheim (オリヴァー・ラウレンツ・フリートハイム, Orivā Raurentsu Furītohaimu)

Voiced by: Shun'ichi Toki

Arnold's personal attendant.

Elmity Kingdom

Dietrich (ディートリヒ, Dītorihi)

Voiced by: Nobuhiko Okamoto

The prince to whom Rishe was engaged in every time loop. After lies are spread about Rishe, he annuls their engagement. He's narcissistic and full of himself, so it was a shock that Rishe tells him off in the current loop; plus his kinder father forcing humility to ask Rishe to marry Arnold to ensure peace with the Galkhein Kingdom.

Marie (マリー, Marī)

Voiced by: Yui Kondo

The new fianceé of Prince Dietrich who made up the lies about Rishe. However, she did it so she could marry the prince for the sake of her family. Rishe informs her that she is aware of the situation and holds no anger towards her, telling Marie to find happiness for herself.

Media

Light novel

Written by Touko Amekawa, the series began publication on the novel posting website Shōsetsuka ni Narō on February 7, 2020. The series was later acquired by Overlap, who began publishing the series in print with illustrations by Wan Hachipisu on October 25, 2020. As of December 2023, six volumes have been released.

In October 2021, Seven Seas Entertainment announced that they licensed the series for English publication.

Volumes

No.	Original release date	Original ISBN	English release date	English ISBN
1	October 25, 2020	978-4-8655-4767-2	July 19, 2022	978-1-63858-393-6
2	February 25, 2021	978-4-8655-4852-5	November 29, 2022	978-1-63858-394-3
3	June 25, 2021	978-4-8655-4944-7	April 4, 2023	978-1-63858-858-0
4	November 25, 2021	978-4-8240-0029-3	August 1, 2023	978-1-68579-648-8
5	August 25, 2023	978-4-8240-0218-1	April 30, 2024	979-8-88843-084-2
6	December 25, 2023	978-4-8240-0690-5	—	—

Manga

A manga adaptation, illustrated by Hinoki Kino, began serialization on the Comic Gardo website on December 5, 2020. As of February 2024, the series' individual chapters have been collected into six tankōbon volumes.

In December 2021, Seven Seas Entertainment announced that they licensed the manga for English publication.

Volumes

No.	Original release date	Original ISBN	English release date	English ISBN
1	June 25, 2021	978-4-8655-4952-2	September 27, 2022	978-1-63858-638-8
2	November 25, 2021	978-4-8240-0036-1	December 13, 2022	978-1-63858-768-2
3	June 25, 2022	978-4-8240-0224-2	June 27, 2023	978-1-68579-559-7
4	February 25, 2023	978-4-8240-0431-4	December 5, 2023	979-8-88843-064-4
5	August 25, 2023	978-4-8240-0599-1	June 25, 2024	979-8-88843-783-4
6	February 25, 2024	978-4-8240-0751-3	—	—

Anime

An anime television series adaptation was announced on August 18, 2023. It will be produced by Studio Kai and Hornets and directed by Kazuya Iwata, with scripts written by Touko Machida, character designs handled by Kenichi Ōnuki, and music composed by Satoshi Hōno and Ryūnosuke Kasai. The series aired from January 7 to March 24, 2024, on AT-X and other networks. The opening theme song is "Another Birthday", performed by Shun'ichi Toki, while the ending theme song is "Kienai" (消えない), performed by The Binary. Crunchyroll licensed the series. Muse Communication licensed the series in South and Southeast Asia.

Episodes

No.	Title	Directed by	Written by	Storyboarded by	Original air date
1	"The Fiancé Who Killed Me" Transliteration: "Watashi o Koroshita Konyakusha" (Japanese: 私を殺した婚約者)	Toshikatsu Tokoro	Touko Machida	Kazuya Iwata	January 7, 2024 (2024-01-07)
Royal knight Rishe is killed during an invasion by Emperor Arnold of Galkhein Empire, only to awaken 5 years in the past on the night her fiancé Prince Dietrich exiled her for fictitious crimes. Rishe is unconcerned however as she is stuck in a time loop and this will be the 6th time she has died at 20 and awoken at 15 again on the night of her exile. During each loop she has led completely different lives including merchant, herbalist, scholar, maid and finally royal knight, but each time she inevitably died in a war at 20 and woke up at 15 again. For her 7th life she decides to live a quiet, easy life, but immediately encounters Arnold, who murdered her in her 6th life only minutes ago. Being 5 years younger, Arnold is not yet Emperor, and he is instantly drawn to her confidence, though she is indifferent to him since it was the war Arnold started that has killed her 6 times. The delay causes her to have a second confrontation with Dietrich in which she humiliates him in public and even shows sympathy for his next fiancée Lady Marie. Sensing an attack, she defends herself from a surprise strike from Arnold, who has deduced from her movements that she is a sword master. Arnold is even more impressed and suddenly asks her to marry him.
2	"The Golden Imperial Capital" Transliteration: "Kiniro ni Somaru Sumeragi to" (Japanese: 金色に染まる皇都)	Yoshikawa Shigatsu	Touko Machida	Kazuya Iwata Minoru Ohara	January 14, 2024 (2024-01-14)
Dietrich's father the King arrives disgusted by Dietrich's behaviour and apologises to Rishe, imploring her to accept Arnold's proposal to maintain friendship between their nations. Rishe accepts; hoping to discover why Arnold declares war in the future after assassinating his own father. She also informs Arnold he is never to touch her and she won't be performing any royal duties. Travelling to his Empire they are attacked by bandits, and Rishe is surprised that Arnold shows mercy by defeating them without killing them. Rishe earns his men's loyalty by mixing an antidote for their poisoned sword wounds. Arnold thanks her, as each of his knights are valued friends. Rishe is confused what could turn such a caring man into a tyrant. Arnold reveals for political reasons she is technically his hostage, though Rishe is pleased as this will provide a justification for lazing around. Arriving in Galkhein, Rishe takes over a disused royal villa which she cleans herself, puzzling her guards. She also encounters and helps Elsie, a new maid being bullied by older maids. Arnold grows even more enamoured with all her skills it is unusual for noble ladies to have and promises to support her in doing whatever she wants. Rishe refuses to fall for his charm and is determined to uncover the evil in his heart.
3	"A Thinly Veiled Sword Dance (Rondo)" Transliteration: "Usuginugoshi no Kenbu (Rondo)" (Japanese: 薄衣越しの剣舞（ロンド）)	Munehisa Sakai	Touko Machida	Munehisa Sakai	January 21, 2024 (2024-01-21)
Arnold decides to reveal Rishe as his fiancée at a royal party. This does not sit well with the nobles’ jealous daughters who attempt to prank her, though she easily outwits them. While dancing with Arnold, Rishe analyses his movements to decipher how he killed her so easily and discovers his left shoulder is covered in old scars that limit his movement, though he asks her to keep this secret. While helping the maids, Rishe notes most of the bullying is from senior maid Diana and quickly determines the reason. At the maid selection Diana is horrified to learn Rishe is Arnold’s fiancée and that Elsie and other junior maids have been selected while she has not. Rishe points out that, as a merchant’s daughter, Diana is the only maid who can read and write which helped her learn faster, causing her to become frustrated at slow learners like Elsie. Realising her error, Diana sincerely apologises and is amazed when Rishe declares her royal villa will be where all junior maids train with Diana in charge of teaching them to read and write. Arnold is amused by Rishe’s craftiness. Rishe arranges a meeting with Kaine Tully of the Aria Trading Company, the merchant who trained her in her first life, whom she is determined to have as her ally once again.
4	"Turning the Knave into a Secret Spice" Transliteration: "Supaisu wa Kakushimi ni" (Japanese: 曲者（スパイス）は隠し味に)	Yukio Takahashi	Futa Takei	Yukio Takahashi	January 28, 2024 (2024-01-28)
Kaine refuses to do business with her; pointing out a future queen would never use such a small trading company for her wedding without a political motive, and he is uninterested in royal politics. Needing him to avoid Arnold’s future war, Rishe remembers Kaine’s fondness for risky gambles and sneaks out of the palace to offer him a deal; if in 7 days she can create a profitable business he will become her trading partner no questions asked. Arnold is upset, not that she snuck out as she is free to do as she wants, but she did so without guards. He then insists next time she sneaks out she take him with her for protection and fun. After sharing a midnight snack Rishe tells him of her wager with Kaine but hides the details. Arnold is amused then abruptly warns Rishe if she encounters his younger brother, Theodore, she should ignore him. The next day she encounters Theodore who conspiratorially warns her he will free her from being Arnold's hostage. Rishe overhears Arnold creating a policy that the army protect civilians, not just nobles, once again confusing her how different he is to his future self. With a fake note from Arnold Theodore succeeds in luring Rishe to a church alone at midnight.
5	"Another Kind of Trade" Transliteration: "Mō Hitotsu no Akinai" (Japanese: もうひとつの商い)	Shuji Saito	Futa Takei	Kunihisa Sugishima	February 4, 2024 (2024-02-04)
Theodore tries to impress on Rishe that Arnold is a war criminal who even killed their mother, then is shocked that Rishe already knew and even brought Arnold to the meeting. Theodore quickly leaves. Despite his anger Rishe asks why so many people think he is evil when he does so much good. Arnold hints at atrocities he had to commit during war and is surprised by her willingness to confront him, then shocks her with their first kiss. Rishe enlists her maids in creating nail polish to show Kaine and learns from Elsie that poverty is quite a problem. Rishe thus offers Kaine exclusive rights to manufacture polish as long as he only hires workers from the slums. Kaine is sceptical until Rishe recites a lesson she once learned from him. When he still refuses Rishe reveals she knows he has a sick sister, Aria. Kaine is furious until Rishe reveals she has been cultivating her own herb garden for this express reason and has created a medicine to cure her for free, even if he still refuses her partnership. Casting aside his arrogance Kaine agrees to Rishe’s proposal without further hesitation. Rishe faints from her several sleepless nights but is later kidnapped from her room by Elsie and her guard Kamil who take her to Theodore.
6	"The Only One in the World" Transliteration: "Sekai ni Tatta Hitori no" (Japanese: 世界にたったひとりの)	Shigatsu Yoshikawa Takahiro Tanaka	Futa Takei	Yui Umemoto	February 11, 2024 (2024-02-11)
Flashbacks show Rishe agreed to be kidnapped as Elsie and Kamil were born in the slums where Theodore has been doing charity work for years. Theodore demands Arnold give up being royal heir, but Arnold reveals Theodore has underestimated Rishe, who suddenly walks into the room, having defeated her guards and escaped. She deduces Theodore’s true goal was to dishonour himself and be exiled rather than stay knowing Arnold has no interest in him. After Theodore runs away Rishe accuses Arnold of only acting uninterested so Theodore will be less upset if Arnold dies in another war. She then shames him with the possibility Theodore might die first, and if so, Arnold would definitely regret mistreating him. Rishe finds Theodore on the roof and hints she has a plan to save Arnold. Theodore is too upset and throws himself off the roof, hoping his death will force Arnold to stay alive as sole surviving heir. Arnold appears and catches him, leading to Arnold admitting he does care about Theodore. Relieved, Rishe is finally able to sleep for the first time in a week, collapsing in Arnolds arms. Awakening later, Arnold thanks her for helping Theodore and then teases her with the memory of their kiss. Theodore resumes charity work while offering Rishe access to his agents from the slums to support her plan for saving Arnold.
7	"A Lullaby Like the Beat of a Heart" Transliteration: "Kodō Kizamu Komoriuta" (Japanese: 鼓動刻む子守唄)	Kazuya Iwata Riki Fukushima	Toshizo Nemoto	Kunihisa Sugishima	February 18, 2024 (2024-02-18)
Rishe asks Theodore for an unusual favour. She then asks Arnold to start living with her in her villa, in separate bedrooms. Arnold knows she is plotting something but agrees anyway as he is sure it will be amusing. Rishe asks Arnold to instruct her in the sword style used only by him and the Imperial Guards. During the duel Rishe compares Arnold with his future self and starts to understand his sword, but still loses to him. Arnold notices she moves as though she has fought an opponent even stronger than him and wonders who it was. For his victory Arnold invites her to visit the city with him in two days. He then embarrasses her by carrying her back to the villa as her legs are too tired to walk. After he moves into the villa Rishe notices Arnold skipping sleep to carry on working and stubbornly helps him take a nap, during which she notices his scars again. Arnold notices it is easier to sleep while sharing a bed than sleeping alone. Rishe accidentally falls asleep too and is embarrassed when they are almost seen by Arnolds secretary Oliver. Rishe acquires a boy’s wig from Kaine and uses it to be accepted on a ten day training course to become a knight.
8	"The Color of the Sea beyond the Horizon" Transliteration: "Umishoku no Kanata" (Japanese: 海色の彼方)	Yukio Takahashi	Toshizo Nemoto	Yukio Takahashi	February 25, 2024 (2024-02-25)
With Theodore’s unusual favour Rishe is accepted into the training as a man named Lucius, overseen by Count Lawvine, whom Rishe remembers is exceptionally loyal but is executed as a war criminal by Arnold in 3 years. For their visit to the city Rishe is, against her will, dressed very prettily by Elsie as though it were a date. Arnold takes Rishe to meet Mihaela, a very exclusive jewellery shop owner, who tests Rishe to identify fake gemstones. With her merchant training Rishe passes the test easily. Having impressed her Mihaela agrees Arnold may purchase an item for Rishe, specifically, the ring for their wedding. Rishe is surprised as rings are not used in Galkhein’s wedding ceremony, but is convinced to accept it after Arnold points out such an expensive purchase will benefit the economy noticeably. Rishe embarrasses herself by requesting a jewel of the same icy blue as Arnolds eyes. From several clues Rishe deduces Arnold timed their trip to coincide with the arrival of Prince Kyle from Coyolles kingdom, a small but wealthy nation Arnold destroys in the future. Rishe remembers him from her life as a herbalist as Kyle is sickly. Arnold dislikes Kyle and is certain he is up to something, so he wants Lawvine to watch him. Rishe worries if Lawvine spends too much time around them he will realise she is Lucius.
9	"Visitor from the North" Transliteration: "Kita Kara no Raihōsha" (Japanese: 北からの来訪者)	Shigatsu Yoshikawa	Toshizo Nemoto	Kunihisa Sugishima	March 3, 2024 (2024-03-03)
Rishe struggles over how to get Kyle the medicine he needs without Lawvine seeing her. By chance she encounters Professor Michel, her herbalism instructor from her third life. With Michel’s support Kyle is convinced to take Rishe's new medicine. Michel senses Riche despises the medicine, unaware in her third life they created it together but disagreed over using human test subjects. Due to the late hour Arnold comes to fetch Rishe and gifts her his own pocket watch so she will stop being late. Rishe shares with Arnold that Michel actually considers himself an alchemist. At a party Rishe is satisfied her medicine is already improving Kyle’s health. Using the hunting skills from her fifth life Rishe is able to mingle with the guests without making it obvious she is avoiding Lawvine. Kyle asks Arnold to supply soldiers to protect Coyolles in exchange for gold and jewels, but Arnold sees through his deception and deduces Coyolles is actually in dire circumstances from its gold mines running out of gold. Rather than fight Coyolles enemies Arnold points out Galkhein would profit more by conquering Coyolles first. Rishe knows this is a vital moment that will shape the future and to avoid war she needs Arnold to believe Kyle is his equal deserving of his help, but has no idea how to achieve this.
10	"A Sweetly Fragrant Cigarette Is Lit" Transliteration: "Kaori Tabako ni Hi ga Tomoru" (Japanese: 香り煙草に火がともる)	Shunpei Umemoto	Touko Machida	Hiroaki Yoshikawa	March 10, 2024 (2024-03-10)
Michel hopes to have a discussion with Arnold about alchemy. Rishe falls behind during training as she fears the war growing closer. Lawvine shares her worries as his son died in the previous war. Arnold decides to observe the training and recognises her but says nothing to Lawvine. Instead he confronts her privately and, finding the situation amusing, allows her to continue training on strict condition she not be discovered. Rishe speaks with Kyle and learns he respects Arnold, having realised Arnold committed acts of cruelty knowing it would benefit the world later, such as slaughtering an enemy kingdoms royal family to end a war quickly and prevent further suffering to the commoners. Rishe decides to form her own alliance with Kyle. Michel reveals to Rishe he plans to sell Arnold his creation, explosive Black Powder for use in war, unaware their disagreement about black powder ended their friendship in her 3rd life. Growing desperate Rishe asks Theodore to lend her some of his spies for a small but helpful act of rebellion, which amuses Theodore greatly. Michel recalls even as a child he excelled at creating new methods of death and destruction, coming to believe the sole reason he was born was to help destroy the world.
11	"The Determination of a Snow Flower" Transliteration: "Yukibana no Ketsui" (Japanese: 雪花の決意)	Shuji Saito	Touko Machida	Kazuya Iwata Masayoshi Nishida	March 17, 2024 (2024-03-17)
While observing fireflies together Rishe finds it odd Arnold is the cause of all her fear and yet she is still drawn to him. To better see the fireflies she impulsively jumps from her balcony to Arnolds, who catches her, embarrassingly. Arnold dislikes the fireflies which resemble flaming torches on battlefields, and admits that he despises his father, the Emperor, and by extension the entire Galkhein Kingdom. He then warns Rishe if there comes a time she stands in his way, he will kill her himself. Despite this, Rishe promises she will change how he sees the world. As part of her plan, Rishe obtains several rare metals from Kyle. Michel manages to evade Theodores men following him. Rishe helps Kyle plead his case that his kingdom's jewellers could easily turn their skills to clockwork mechanisms like those found in Arnold's incredibly rare pocket watch, leading to valuable breakthroughs in technology. Arnold points out he could gain these things anyway by a military takeover of Coyolles, though Kyle still chooses to hope Arnold will choose a future of peace over another war. Theodore interrupts the meeting to tell Rishe that Michel disappeared for three hours, only to allow himself to be found in the castle gardens. Rishe and Theodore are surprised by Arnold's reaction and have no idea what he is planning to do.
12	"The Most Beautiful Thing" Transliteration: "Ichiban Utsukushī Mono" (Japanese: いちばん美しいもの)	Yukio Takahashi	Touko Machida	Kunihisa Sugishima	March 24, 2024 (2024-03-24)
Michel announces he has placed a bomb in town to show Arnold the power of black powder. However, Rishe knew from her previous life the details of his plan and with Theodore’s assistance the bomb has already been turned into fireworks. Michel realises Rishe was trying to show him that just because black powder is destructive does not mean it cannot be used for good. Arnold forms a treaty with Coyolles. Arnold is tempted to assassinate Michel in secret, so Rishe reveals it was Michel who invented the pocket watch, making him too valuable to kill. Rishe hopes Arnold will learn the same lesson as Michel and realise his skills aren’t only valuable for waging wars. Rishe’s ring is delivered, and though Arnold hesitates to place any real importance on it, he is surprised when Rishe insists it already has deep emotional value to her and insists he place it on her finger himself. Arnold is amazed how happy it makes him to see her wearing the ring. Rishe asks if they can go on a trip to find even more wonderful things for Arnold to enjoy, but Arnold refuses, hinting he already has something wonderful he enjoys very much. Rishe is happy to have changed Arnold’s heart even just a little and plans to make many more small changes that will eventually save the future.

Reception

Rebecca Silverman from Anime News Network praised the heroine, artwork, and the story, calling it unique.

Naoki Harada, an editor for Comic Gardo, picked the manga as his favorite manga from 2021.

In his review of the series, DoubleSama explained how the full title of 7th Time Loop: The Villainess Enjoys a Carefree Life Married to Her Worst Enemy! could mislead viewers into assuming it's something that it's not. He pointed out how the title is reminiscent of My Next Life as a Villainess: All Routes Lead to Doom!, but that the two series turned out to be very different from each other. And, he ultimately gave the anime a rating of 7/10, saying that it was "a lot more interesting" than expected.

By February 2024, the series had over 1 million copies in circulation.

External links

• Official website at Shōsetsuka ni Narō (in Japanese)
• Light novel official website (in Japanese)
• Manga official website at Comic Gardo (in Japanese)
• Anime official website (in Japanese)
• 7th Time Loop (light novel) at Anime News Network's encyclopedia