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Betrothed to My Sister's Ex

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Betrothed to My Sister's Ex
First light novel volume cover
ずたぼろ令嬢は姉の元婚約者に溺愛される
(Zutaboro Reijō wa Ane no Moto Konyakusha ni Dekiai Sareru)
GenreRomance[1]
Novel series
Written byTobirano
Published byShōsetsuka ni Narō
Original runOctober 23, 2019 – present
Light novel
Written byTobirano
Illustrated byMai Murasaki
Published byFutabasha
English publisher
ImprintM Novels f
Original runApril 15, 2020 – present
Volumes8
Manga
Written byTobirano
Illustrated byChikage Nakakura
Published byFutabasha
English publisher
  • NA:
    • Pocket Comics (digital)
    • Seven Seas Entertainment
ImprintMonster Comics
MagazineGaugau Monster
Original runJuly 24, 2020 – present
Volumes9
Anime television series
Directed byTakayuki Kitagawa
Written byKenta Ihara
Music byKujira Yumemi
StudioLandQ Studios
Licensed byCrunchyroll
Original networkMBS, TBS, CBC, BS-TBS
Original run July 5, 2025 – present
Episodes2

Betrothed to My Sister's Ex (ずたぼろ令嬢は姉の元婚約者に溺愛される, Zutaboro Reijō wa Ane no Moto Konyakusha ni Dekiai Sareru; lit. "Loved by Her Sister's Former Fiancé") is a Japanese light novel series written by Tobirano and illustrated by Mai Murasaki. It began serialization online in October 2019 on the user-generated novel publishing website Shōsetsuka ni Narō. It was later acquired by Futabasha, who have published eight volumes since April 2020 under their M Novels f imprint. A manga adaptation with art by Chikage Nakakura has been serialized online via Futabasha's Gaugau Monster website since July 2020 and has been collected in nine tankōbon volumes. An anime television series adaptation produced by LandQ Studios premiered in July 2025.

Premise

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Marie was abused and taken advantage of her entire life by her parents, resulting in her lack of self-esteem. On her birthday, her parents present her sister Anastasia as the star of the evening; leading her to stay in the garden to avoid attention. This leads to her meeting duke Cyrus, who falls in love with Marie due to her sweet personality. However, because of the misunderstanding caused by her parents, Marie's name gets mixed up with her sister's when Cyrus sends his marriage proposal. Anastasia goes missing and is presumed dead when heading to Cyrus's home; resulting in Marie being sent to comfort him. Cyrus realizes his mistake with the sisters names, but Maria cannot understand it herself; resulting in a very long struggle to break her out of her mindset.

Characters

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Marie Shaderan (マリー, Marī)
Voiced by: Rena Motomura[2]
The heroine, who lived a very Cinderella life. Having spent her life being called ugly and stupid, Marie is frustratingly unable to understand that Anastasia was never whom Kyros wished to marry; even when he states to her face that he got their names wrong because of her poor wording. She is meek around others and tries to conform to what she thinks is appropriate, which only makes things worse for her; everyone at Kyros's estate cannot figure out what she likes in order to help her adjust better. However, as she spends more time free of her parents' abuse, Marie begins to discover how much she enjoys being free to choose.
In truth, she has been running her family's estate due to her father being too much of an imbecile. All the abuse she suffered was to keep Marie from ever desiring to leave after seeing just how bad a shape her home was in.
Kyros Granado (キュロス, Kyurosu)
Voiced by: Daiki Hamano[2]
The duke whom fell in love with Marie. He was born to his father's foreign mistress Liu-Liu, while the official duchess never bore a child; with the untimely demise of his father, along with Kyros's own accomplishments on the battlefield, he became the next duke without any backlash. He's loathed noble women who only ever wanted to marry him for status, which is why he was so drawn to Marie; she didn't care about status and had a caring heart. Even though he repeatedly explains to Marie that he got their names mixed up, Kyros is left utterly frustrated with her being unable to accept that she is NOT a replacement for her sister. This comedically leads to him showering her in unnecessary gifts and learning Marie has no clue as to how to choose what she likes on her own.
Kyros ultimately decides to bring the abuse Marie has suffered to the public eye, believing it will also help save her homeland from her father's incompetence.
Anastasia Shaderan (アナスタジア, Anasutajia)
Voiced by: Minami Tanaka[3]
Marie's younger sister. She was close to Marie as a child, but her parents forced them apart in order begin conditioning Marie into being their slave; while pampering Anastasia to make her ignore what was going on. Anastasia noticed the horrible things, but because she took Marie's face value word that she was fine, she tried to ignore it for years. Once the engagement to Kyros arrived, Anastasia could tell from the dress sent as a gift that he had gotten her and Marie's names mixed up. She used the carriage ride to run away and hide out as a boy, getting a job as an apprentice tailor.
Luifon (ルイフォン, Ruifon)
Voiced by: Ryōhei Kimura[3]
Mio (ミオ)
Voiced by: Yoko Hikasa[3]
Head maid of Kyros's household. She is polite and very no-nonsense, but looks after Marie with kindness; seeing she has such poor self-esteem that she has to constant direct her into not overreacting. Within the early days of her serving Marie, Mio fires two maids sent by to be the ladies-in-waiting; they had be exacerbating Marie's confidence issues in a long term plot to become Kyros's mistresses. This not only angered Mio, but made Kyros so upset her gave them a death glare. Mio often investigates or goes undercover to find information for Kyros, leading to her leaving the estate to learn more about Marie's background.
Liu-Liu (リュー・リュー, Ryū Ryū)
Voiced by: Sayaka Ohara[3]
Kyros's mother and the mistress of his late father. While she is fluent in both her native and the local language, she has trouble writing and reading the latter. Liu-Liu very much likes Marie and makes the effort along with Kyros and Mio to help her get past her unnecessary self-doubts. When Marie explained she did most of the talking and paperwork for her father, Liu-Liu realized that the entire reason that her parents didn't want her to go was because they couldn't do the work themselves.
Liu-Liu can often be found in the library, where she bonds with Marie over their love of literature.
Toppo (トッポ)
Voiced by: Tetsuya Kakihara[4]
The chef of Kyros' household. He is a large and very emotional man who tends to cry frequently and is easily moved by praise of his cooking. He tends to cook in excessive amounts, due to having a larger eating capacity.
Thomas (トマス, Tomasu)
Voiced by: Tatsuyuki Kobayashi[4]
Tunica (チュニカ, Chunika)
Voiced by: Yūka Aisaka[4]

Media

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Light novel

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Written by Tobirano, Betrothed to My Sister's Ex began serialization on the user-generated novel publishing website Shōsetsuka ni Narō on October 23, 2019.[5] It was later acquired by Futabasha who began publishing the series with illustrations by Mai Murasaki under their M Novels f light novel imprint on April 15, 2020. Eight volumes (including six volumes published digital-only) have been released as of January 2025.[6]

In April 2025, Seven Seas Entertainment announced that they had licensed the series for English publication beginning in January 2026.[7]

No. Release date ISBN
1 April 15, 2020[8]978-4-575-24267-6
2 September 15, 2020[9]978-4-575-24324-6
3 February 10, 2022 (ebook)[10]—
4 August 7, 2022 (ebook)[11]—
5 February 10, 2023 (ebook)[12]—
6 August 10, 2023 (ebook)[13]—
7 May 10, 2024 (ebook)[14]—
8 January 10, 2025 (ebook)[6]—

Manga

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A manga adaptation illustrated by Chikage Nakakura began serialization on Futabasha's Gaugau Monster website on July 24, 2020.[15] The manga's chapters have been collected into nine tankōbon volumes as of June 2025.[16] The manga adaptation is published digitally in English on Comico's Pocket Comics website.[17] In April 2025, Seven Seas Entertainment announced that they had also licensed the manga adaptation for English publication beginning in January 2026.[7]

No. Original release date Original ISBN English release date English ISBN
1 January 15, 2021[18]978-4-575-41197-3January 20, 2026[19]979-8-89561-752-6
2 July 15, 2021[20]978-4-575-41276-5——
3 January 14, 2022[21]978-4-575-41353-3——
4 July 8, 2022[22]978-4-575-41454-7——
5 February 10, 2023[23]978-4-575-41566-7——
6 August 10, 2023[24]978-4-575-41704-3——
7 April 10, 2024[25]978-4-575-41858-3——
8 December 25, 2024[26]978-4-575-42044-9——
9 June 25, 2025[16]978-4-575-42176-7——

Anime

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An anime television series adaptation was announced on July 29, 2024.[17] It is produced by LandQ Studios and directed by Takayuki Kitagawa, with series composition and episode screenplays handled by Kenta Ihara, characters designed by Akiko Satō, and music composed by Kujira Yumemi. The series premiered on July 5, 2025, on the Animeism programming block on MBS, TBS, CBC and BS-TBS.[2][a] The opening theme song is "Gesshoku" (月蝕; Lunar Eclipse), performed by Krage, while the ending theme song is "Marie" (マリー, Marī), performed by Myuk [ja].[3] Crunchyroll is streaming the series.[27]

Episodes

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No.Title [28][29]Directed by [28]Written by [28]Storyboarded by [28]Original release date [a]
1"I Could Never Replace My Sister"
Transliteration: "Ō Ane-sama no Kawarida Nante Zettai Muridesu" (Japanese: お姉様の代わりだなんて絶対無理です)		Takayuki KitagawaKenta IharaTakayuki KitagawaJuly 5, 2025 (2025-07-05)
Marie is the daughter of Baron Shaderan and lives in the shadow of her older sister Anastasia who is treated like a princess. Their estate is poor and it is often left to Marie to handle her father’s paperwork. Marie’s birthday is overlooked in favour of a party for Anastasia so she can find a husband. The only one to show concern for Marie is Anastasia herself. Crying in the garden Marie meets Lord Kyros who is surprised Marie has studied his Ipsandros culture. Later, Kyros sends a letter asking to marry Anastasia, disappointing her as Kyros has a reputation of hating women. Marie is surprised Anastasia has actually spent years learning to make clothes and dreams of opening a shop in the capital. On the way to Kyros’ estate Anastasia’s carriage gets into an accident and her body is never found. Having already sold Kyros’ betrothal gifts Shaderan insists Marie seduce Kyros instead. At Kyros’ estate head maid Mio is shocked to see Marie alive and it transpires Kyros thought Marie was Anastasia, and it was Marie he actually wanted to marry. Marie realises she has somehow become Kyros’ fiancée. Kyros’ mother Liu-Liu diagnoses Marie as lacking confidence and decides to help her find some before the wedding. Marie suddenly claims she can’t marry him.
2"Marie, I Want to Marry You"
Transliteration: "Ore wa Marī o Metoritai" (Japanese: 俺はマリーを娶りたい)		Tomason & Takayuki KitagawaKenta IharaTakayuki KitagawaJuly 12, 2025 (2025-07-12)
Kyros blames Shaderan for making Anastasia the centre of attention at Marie’s birthday, leading to him mixing up their identities. It is explained his father Duke Granado had two wives, Duchess Laura who only gave birth to daughters, and Liu-Liu his Ipsandros mistress who gave birth to Kyros. When the Duke chose Kyros as heir, Laura killed herself. Liu-Liu chose to raise Kyros by herself and over the years he developed a dislike for noble ladies who only wanted to marry him for his title. Seeking a loveless marriage of convenience Kyros sought out the daughter of a poor noble and was surprised to meet Marie. Having made an appalling first impression, Mio demands Kyros fix it. He tries to apologise, but Marie can only believe Kyros sees her as a substitute for Anastasia, despite him clearly explaining mixing up their names in his letter. Marie agrees to the betrothal but asks if she can return home to receive instructions from Shaderan, having failed to seduce Kyros into bed like he ordered. Infuriated at Shaderan’s outrageous behaviour Kyros forbids Marie from going for her own safety. The next morning Marie realises she has no chores to do, and in fact has personal maids Hannah and Ilza to care for her.
3"A Life I Saw in a Dream, and a Dream-like Life"
TBATBATBAJuly 19, 2025 (2025-07-19)
Marie is excited Hannah and Ilza came from the royal palace and might have interesting stories, but something about them reminds her of her parents, scaring her. She is given a manor house in the castle grounds and learns Kyros hires servants from multiple nations despite the kingdoms distrust of foreigners. Hannah and Ilza continue to make her worry about doing anything wrong. Kyros is annoyed his duties keep him away for days. Marie enjoys talking with the gardener Johan about his vegetable garden, but Hannah and Ilza's rude comments make Marie fear she has insulted Johan and disappointed Kyros. Kyros returns late that night and invites Marie to share his midnight snack, though head chef Toppo also seems disapproving. It turns out he is upset Marie leaves meals half uneaten as though she dislikes his food, when really Marie is unused to large meals and cannot eat it all. Kyros clears up the misunderstanding and asks if anything else makes her uncomfortable. Scared of Hannah and Ilza she claims to be happy. Kyros shows her a tea making ceremony from Ipsandros. Waiting for the tea they play a word game Marie used to play with Anastasia and Marie finds herself having fun until they accidentally embarrass themselves in front of Mio and ruin the tea.

See also

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Notes

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  1. ^ a b MBS, TBS and CBC listed the series premiere on July 4, 2024, at 25:53, which is effectively July 5 at 1:53 a.m. JST.[30]

References

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  1. ^ "Betrothed to my Sister's Ex". Pocket Comics. Comico. Retrieved December 19, 2024.
  2. ^ a b c Hodgkins, Crystalyn (December 20, 2024). "Betrothed to My Sister's Ex TV Anime Reveals July 2025 Debut, Main Cast in 1st Promo Video". Anime News Network. Retrieved December 20, 2024.
  3. ^ a b c d e Hodgkins, Crystalyn (May 23, 2025). "Betrothed to My Sister's Ex Anime Reveals More Cast, July 4 TV Debut in 2nd Promo Video". Anime News Network. Retrieved May 23, 2025.
  4. ^ a b c Hodgkins, Crystalyn (May 30, 2025). "Betrothed to My Sister's Ex Anime Reveals 3 More Cast Members". Anime News Network. Retrieved May 30, 2025.
  5. ^ ずたぼろ令嬢は姉の元婚約者に溺愛される (in Japanese). Shōsetsuka ni Narō. Retrieved July 29, 2024.
  6. ^ a b ずたぼろ令嬢は姉の元婚約者に溺愛される 8 (in Japanese). Futabasha. Retrieved December 19, 2024.
  7. ^ a b "Seven Seas Licenses BETROTHED TO MY SISTER'S EX Manga and Light Novel Series". Seven Seas Entertainment. April 23, 2025. Retrieved April 23, 2025.
  8. ^ ずたぼろ令嬢は姉の元婚約者に溺愛される 1 (in Japanese). Futabasha. Retrieved July 29, 2024.
  9. ^ ずたぼろ令嬢は姉の元婚約者に溺愛される 2 (in Japanese). Futabasha. Retrieved July 29, 2024.
  10. ^ ずたぼろ令嬢は姉の元婚約者に溺愛される 3 (in Japanese). Futabasha. Retrieved July 29, 2024.
  11. ^ ずたぼろ令嬢は姉の元婚約者に溺愛される 4 (in Japanese). Futabasha. Retrieved July 29, 2024.
  12. ^ ずたぼろ令嬢は姉の元婚約者に溺愛される 5 (in Japanese). Futabasha. Retrieved July 29, 2024.
  13. ^ ずたぼろ令嬢は姉の元婚約者に溺愛される 6 (in Japanese). Futabasha. Retrieved July 29, 2024.
  14. ^ ずたぼろ令嬢は姉の元婚約者に溺愛される 7 (in Japanese). Futabasha. Retrieved July 29, 2024.
  15. ^ 『ずたぼろ令嬢は姉の元婚約者に溺愛される』のコミカライズ連載が開始. ln-news.com (in Japanese). July 25, 2020. Retrieved July 29, 2024.
  16. ^ a b ずたぼろ令嬢は姉の元婚約者に溺愛される 9 【コミック】 (in Japanese). Futabasha. Retrieved April 29, 2025.
  17. ^ a b Mateo, Alex (July 29, 2024). "Zutaboro Reijō wa Ane no Moto Konyakusha ni Dekiai Sareru Novels Get TV Anime in 2025". Anime News Network. Retrieved July 29, 2024.
  18. ^ ずたぼろ令嬢は姉の元婚約者に溺愛される 1 【コミック】 (in Japanese). Futabasha. Retrieved July 29, 2024.
  19. ^ "Betrothed to My Sister's Ex (Manga) Vol. 1". Seven Seas Entertainment. Retrieved April 29, 2025.
  20. ^ ずたぼろ令嬢は姉の元婚約者に溺愛される 2 【コミック】 (in Japanese). Futabasha. Retrieved July 29, 2024.
  21. ^ ずたぼろ令嬢は姉の元婚約者に溺愛される 3 【コミック】 (in Japanese). Futabasha. Retrieved July 29, 2024.
  22. ^ ずたぼろ令嬢は姉の元婚約者に溺愛される 4 【コミック】 (in Japanese). Futabasha. Retrieved July 29, 2024.
  23. ^ ずたぼろ令嬢は姉の元婚約者に溺愛される 5 【コミック】 (in Japanese). Futabasha. Retrieved July 29, 2024.
  24. ^ ずたぼろ令嬢は姉の元婚約者に溺愛される 6 【コミック】 (in Japanese). Futabasha. Retrieved July 29, 2024.
  25. ^ ずたぼろ令嬢は姉の元婚約者に溺愛される 7 【コミック】 (in Japanese). Futabasha. Retrieved July 29, 2024.
  26. ^ ずたぼろ令嬢は姉の元婚約者に溺愛される 8 【コミック】 (in Japanese). Futabasha. Retrieved October 26, 2024.
  27. ^ Mateo, Alex (June 18, 2025). "Crunchyroll Announces Release Schedule for Summer 2025 Season". Anime News Network. Retrieved June 18, 2025.
  28. ^ a b c d "STORY｜Terebi Anime「Zutaboro Reijō wa Ane no Moto Konyakusha ni Dekiai Sareru」Koshiki Saito" STORY｜TVアニメ「ずたぼろ令嬢は姉の元婚約者に溺愛される」公式サイト [STORY｜TV Anime「Betrothed to My Sister's Ex」Official Site-]. zutaboro-anime.com (in Japanese). Retrieved July 4, 2025.
  29. ^ "Watch Betrothed to My Sister's Ex - Crunchyroll". Crunchyroll. Retrieved July 4, 2025.
  30. ^ "Terebi Anime「Zutaboro Reijō wa Ane no Moto Konyakusha ni Dekiai Sareru」Koshiki Saito" TVアニメ「ずたぼろ令嬢は姉の元婚約者に溺愛される」公式サイト [TV Anime「Betrothed to My Sister's Ex」Official Site-]. zutaboro-anime.com (in Japanese). Retrieved July 4, 2025.
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