The upcoming anime adaptation of “Betrothed to My Sister’s Ex” (Zutaboro Reijou wa Ane no Moto Konyakusha ni Dekiai sareru) has unveiled its second promo video, revealing additional cast members and confirming its TV debut on July 4th. Fans of romance and drama anime are eagerly awaiting this series, which promises a heartwarming and engaging story.
Premiere Date and Where to Watch
“Betrothed to My Sister’s Ex” is scheduled to premiere on July 4th, 2025 (JST), which effectively translates to July 5th at 1:53 PM JST. The anime will air on the Animeism programming block on MBS, TBS, CBC, and BS-TBS.
New Cast Members
In addition to the previously announced lead voice cast, the second promo video revealed several new cast members who will play key roles in the series:
- Minami Tanaka as Anastasia
- Yoko Hikasa as Mio
- Ryohei Kimura as Luifon
- Sayaka Ohara as Lyu-Lyu
These actors join Rena Motomura, who voices Marie, and Daiki Hamano, who voices Kyuros.
Production Staff
The anime is being produced by LandQ Studios, with a talented team of creators:
- Director: Takayuki Kitagawa
- Assistant Director: Masakazu Sunagawa
- Series Composition/Script: Kenta Ihara
- Character Design: Akiko Sato
- Music: Kujira Yumemi
Theme Songs
The opening and ending theme songs for “Betrothed to My Sister’s Ex” have also been announced:
- Opening Theme: “Gesshoku” by Krage
- Ending Theme: “Marie” by Myuk
Plot Overview
The story of “Betrothed to My Sister’s Ex” centers around Marie, the neglected younger daughter of Baron Shederan. She is treated like a servant and forced to wear tattered clothing, leading a difficult life in her own home. One day, at her birthday party, Marie meets Count Kyuros Granado, a wealthy nobleman. Due to her appearance, Kyuros mistakes her for a maid but is captivated by her sincerity.
A misunderstanding leads Kyuros to propose marriage to Marie’s glamorous older sister, Anastasia. However, tragedy strikes when Anastasia dies in a carriage accident before the wedding. To salvage the situation, Marie is compelled by her family to take her sister’s place as Kyuros’s fiancée.
Unbeknownst to Kyuros, Marie is the woman he truly admired from the start. As they navigate their new relationship, Marie struggles with low self-esteem, believing that Kyuros only loved her sister. Kyuros, on the other hand, endeavors to show Marie that she is the one he truly desires.
From Light Novel to Anime
“Betrothed to My Sister’s Ex” began as a web novel series on Shōsetsuka ni Narō, penned by Tobirano in 2019. The series gained popularity and was later acquired by Futabasha, who began publishing it as a light novel with illustrations by Mai Murasaki. A manga adaptation, illustrated by Chikage Nakakura, launched on Futabasha’s Gaugau Monster website in July 2020.
The manga adaptation is available in English on Comico’s Pocket Comics website, and both the light novel and manga have been licensed for English publication by Seven Seas Entertainment, with releases scheduled for January 2026.
Where to Read the Manga
For those eager to dive into the world of “Betrothed to My Sister’s Ex” before the anime airs, the manga adaptation is a great place to start. It is available digitally on Pocket Comics.
A Romantic Journey
“Betrothed to My Sister’s Ex” promises to be a captivating anime series filled with romance, drama, and heartwarming moments. With a talented production team, a stellar cast, and a compelling storyline, this anime is poised to capture the hearts of viewers. Be sure to tune in starting July 4th.
