Betrothed to My Sister's Ex

Synopsis

Marie, the second daughter of a poor baron’s household, is treated like a servant by her parents. Even at Marie’s birthday party, her beautiful elder sister, Anastasia, is the star. Outside, Marie bumps into Count Kyuros Granado, who falls for her at first sight. Yet, due to a misunderstanding, the Count proposes to Anastasia. After a tragic accident, Marie must marry the count instead!

First Air Date: 2025-07-05

Last Air Date: 2025-09-20

Number of Seasons: 1

Number of Episodes: 12

Networks: MBS, TBS, CBC

View Technical Specifications on IMDb

Top Cast

Rena Motomura as Marie (voice)
Daiki Hamano as Kyros (voice)
Minami Tanaka as Anastasia (voice)
Ryohei Kimura as Louisphon (voice)
Yoko Hikasa as Mio (voice)
Sayaka Ohara as Ryu Ryu (voice)
Tetsuya Kakihara as Toppo (voice)
Tatsuyuki Kobayashi as Thomas (voice)
Yuuka Aisaka as Tunica (voice)

Seasons

Season 1 (2025)

No overview available for this season.

Episodes:

Ep. 1: I Could Never Replace My Sister (2025-07-05)

Marie is always dressed in tatters and is treated like a servant in her own home. Then she meets Count Kyros.
Ep. 2: Marie, I Want to Marry You (2025-07-12)

Kyros hates aristocratic society and its ties of obligation. But why? And what changed when he met Marie?
Ep. 3: A Life I Saw in a Dream, and a Dream-like Life (2025-07-19)

Marie begins her new life as Kyros' fiancée and finds herself bewildered by the differences from her old life.
Ep. 4: I've Found the Things I Like (2025-07-26)

Kyros wants to provide Marie with every comfort, but Mio cautions him. Then a package from the baron arrives.
Ep. 5: The Prince and the Pitch-Black Warrior (2025-08-02)

Luiphon takes Marie to a sword fighting contest. The ferocity of it scares her. Then the dark warrior fights.
Ep. 6: Am I Enough As I Am? (2025-08-09)

Liu Liu, Kyros' mother, discovers surprising things about Marie. Mio investigates the baron on Kyros' orders.
Ep. 7: You're So Close, I Think You May Make Me Dizzy (2025-08-16)

Mio investigates a comment in a letter from Marie's brother. Marie and Kyros go to the capital for a date.
Ep. 8: A Gift More Lovely Than Jewels (2025-08-23)

Kyros and Marie meet Luiphon at a jeweler's at his request. Thoughts of Anastasia haunt Marie's happiness.
Ep. 9: In Pursuit of Anastasia's Spirit (2025-08-30)

Kyros demands the truth of Anastasia's accident, but he and Marie are not prepared for the answers they find.
Ep. 10: Please Call Off the Betrothal (2025-09-06)

Worried, Kyros arranges to meet with Norman. But as Marie hears him describe his apprentice, her fears grow.
Ep. 11: The Empty Princess Lives (2025-09-13)

Marie's attacker talks about the past. Why did little Marie's life change so much? Why was she left in rags?
Ep. 12: It's Time to Settle This (2025-09-20)

Marie is determined to settle things. But even with everyone's help, how will she confront her parents?