Watch Anime Online: Betrothed to My Sister's Ex (2025)

Betrothed to My Sister's Ex (2025) is a charming anime romance that flips the script on classic fairy tale tropes. When a poor baron's overlooked daughter unexpectedly finds herself betrothed to a charming count—meant for her sister—this comedy-drama explores love, destiny, and second chances. Discover everything you need to know about this delightful new series, from its release date to its stellar voice cast.

Plot Summary: A Cinderella Story with a Twist

Marie, the second daughter of a struggling baron's household, endures a life of servitude under her parents' roof. Despite being the birthday girl, she watches her glamorous elder sister Anastasia steal the spotlight at her own celebration. A fateful encounter outside the party changes everything when Count Kyuros Granado sets eyes on Marie and falls instantly in love. However, a misunderstanding leads the Count to propose to Anastasia instead. When tragedy strikes the family, Marie is forced into a shocking marriage with the Count—the man who was supposed to be her sister's husband. Now she must navigate life as a countess while concealing her true identity and the circumstances that brought them together.

Release Date & Episode Information

Betrothed to My Sister's Ex premiered on July 5, 2025. The complete anime series consists of 12 episodes across 1 season, with the show's run now concluded.

Full Cast & Voice Actors

This engaging series features an impressive ensemble of voice talent bringing the characters to life. The cast includes Rena Motomura, Daiki Hamano, Minami Tanaka, Ryohei Kimura, Yoko Hikasa, Sayaka Ohara, Tetsuya Kakihara, Tatsuyuki Kobayashi, and Yuuka Aisaka.

Production Details & Animation Studios

• Animation Studios: LandQ Studios, Futabasha, NK Animation
• Broadcast Networks: MBS, TBS, CBC
• Country of Origin: Japan
• Genre: Animation, Comedy, Drama
• Series Type: Anime Series
• Rating: 8.24/10

Watch Betrothed to My Sister's Ex Online

Streaming platform availability for Betrothed to My Sister's Ex will be confirmed as we approach and move past the premiere date. Major anime streaming services typically pick up popular titles, so check back here for the most current information on where you can watch this series online.

Stay tuned for streaming updates and additional details about this romantic comedy-drama anime.

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