A third new key visual for the ongoing Betrothed to My Sister’s Ex TV anime series has been unveiled, following the broadcast of the eighth episode on August 23, 2025. The anime first premiered in Japan on July 4, 2025 and will run for 12 episodes.
Takayuki Kitagawa (Chiikawa Episode 106 to 115 storyboard artist and director) is directing the anime series, with Masakazu Sunagawa (Cuticle Detective Inaba) as assistant director, Kenta Ihara (Blue Miburo) as series screenwriter and scriptwriter, and Akiko Sato (A Condition Called Love) as character designer. LandQ Studio is in charge of the animation production.
Meanwhile, the anime’s main voice cast stars:
- • Rena Motomura as Marie
- • Daiki Hamano as Kyros
- • Minami Tanaka as Anastasia
- • Yoko Hikasa as Mio
- • Ryohei Kimura as Luiphon
- • Sayaka Ohara as Liu Liu
The anime is based on the manga by Chikage Nakakura, which adapts a light novel series written by Tobirano and illustrated by Mai Murasaki (who is credited with the original character designs in the anime’s credits). Futabasha first published the light novels on April 15, 2020 and released nine volumes as of August 2025, with the most recent six volumes being distributed as e-books. The series began as a Shosetsuka ni Naro web novel in 2019.
The manga adaptation by Nakakura followed on July 24, 2020. Seven Seas Entertainment licensed the manga for release in English.
Crunchyroll is streaming Betrothed to My Sister’s Ex worldwide, outside of Japan, and describes the main synopsis as:
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!
Sources: Betrothed to My Sister’s Ex Official Twitter, Crunchyroll News
