The upcoming anime adaptation of Tobirano’s light novel series, “Betrothed to My Sister’s Ex” (Zutaboro Reijō wa Ane no Moto Konyakusha ni Dekiai Sareru), has revealed a new trailer, key visual, and additional cast members, stirring excitement among fans. The series is slated to premiere on July 4th in Japan, which effectively translates to July 5th at 1:53 PM JST.
What’s the Story About?
“Betrothed to My Sister’s Ex” tells the story of Marie, the neglected daughter of a baron, often treated as a servant and forced to wear tattered clothing. Her life takes an unexpected turn when she encounters Count Kyuros Granado, a wealthy nobleman who is rumored to be a misogynist. Due to a misunderstanding stemming from her appearance, Kyuros is captivated by Marie, mistaking her for a maid. However, this same misunderstanding leads him to propose to her beautiful older sister, Anastasia, instead.
Tragedy strikes when Anastasia dies in a carriage accident before the wedding. To salvage the situation and repay the already spent dowry, Marie is compelled by her family to take her sister’s place as Kyuros’s fiancée. The catch? Kyuros is unaware that the woman he was initially drawn to was Marie all along.
As Marie and Kyuros navigate their engagement, Marie struggles with low self-esteem, believing that Kyuros was truly in love with her sister. Kyuros, on the other hand, is determined to show Marie that she is the one he genuinely desires. The series promises a heartwarming tale of overcoming misunderstandings, finding love, and personal transformation.
New Cast Members Revealed
Alongside the second trailer and key visual, the official website announced additional cast members who will be joining Rena Motomura (Marie) and Daiki Hamano (Kyuros):
- Minami Tanaka as Anastasia
- Yoko Hikasa as Mio
- Ryohei Kimura as Luifon
- Sayaka Ohara as Lyu-Lyu
These new characters promise to add depth and intrigue to the unfolding story.
Theme Songs Announced
Adding to the anticipation, the opening and ending theme songs for the anime have also been revealed:
- Opening: “Gesshoku” by Krage
- Ending: “Marie” by Myuk
These songs are expected to complement the series’ romantic and dramatic themes.
Production Details
“Betrothed to My Sister’s Ex” is being animated by LandQ studios, with a talented team behind the project:
- Director: Takayuki Kitagawa
- Assistant Director: Masakazu Sunagawa
- Series Composition/Scriptwriter: Kenta Ihara
- Character Designer: Akiko Sato
- Music: Kujira Yumemi
From Web Novel to Anime
The series originated as a web novel on Shōsetsuka ni Narō in 2019, written by Tobirano. It was later acquired by Futabasha, who began publishing it as a light novel series with illustrations by Mai Murasaki. A manga adaptation, illustrated by Chikage Nakakura, has also been serialized on Futabasha’s Gaugau Monster website since July 2020.
Seven Seas Entertainment has licensed both the light novel and manga for English publication, scheduled to begin in January 2026, making the series accessible to a wider international audience.
Where to Watch
“Betrothed to My Sister’s Ex” will premiere on July 4th JST on the Animeism programming block on MBS, TBS, CBC, and BS-TBS in Japan. For international viewers, keep an eye on streaming platforms for availability in your region.
With its charming Cinderella-esque story, talented cast and crew, and captivating visuals, “Betrothed to My Sister’s Ex” is shaping up to be a must-watch anime of the Summer 2025 season.
