In an exciting update for anime fans, the highly anticipated television anime adaptation of Tobirano’s fantasy romance light novel series, Zutaboro: Betrothed to My Sister’s Ex, has revealed additional cast members, a confirmed premiere date, and a captivating second promotional video. The announcement, made on Friday, through the anime’s official website, has heightened anticipation for the series’ debut on July 4, 2025.
The second promotional video confirmed that Betrothed to My Sister’s Ex will premiere on July 4, 2025, airing every Saturday at 1:53 a.m. JST (effectively Friday, July 4, at 25:53 JST) on MBS, TBS, CBC, and later on BS-TBS networks in Japan. The trailer also debuted the anime’s opening theme, Gesshoku, performed by krage, whose emotive vocals complement the series’ romantic and fantastical tone, setting an enchanting mood for the story.
The latest promotional video introduced two new characters, enriching the cast of Betrothed to My Sister’s Ex.
Minami Tanaka voices Anastasia, Marie’s older sister and the eldest daughter of Baron Shederan.
Ryohei Kimura, known for My Teen Romantic Comedy SNAFU and Demon Slayer: Kimetsu no Yaiba, lends his voice to Louisphon, the third prince of the Kingdom of Diltz and a schoolmate of the male lead, Cyrus.
Yōko Hikasa, celebrated for her roles in Kubo Won't Let Me Be Invisible and Horimiya, joins as Mio, the head maid at Kyuros' estate and a guard.
Sayaka Ōhara, recognized for Fairy Tail and My Teen Romantic Comedy SNAFU, also joins the cast as Kyuros' mother.
The video showcased a new key visual, highlighting the lush animation and intricate character designs from LandQ Studios. Directed by Takayuki Kitagawa, the anime promises a visually stunning adaptation of Tobirano’s work, with LandQ Studios’ commitment to capturing the source material’s vibrant world.
What is Betrothed to My Sister’s Ex About?
Betrothed to My Sister’s Ex began as a web novel by Tobirano on the Shousetsuka ni Narou platform in 2019, capturing readers with its heartfelt story of love and redemption. The series was later adapted into a light novel with illustrations by Murasaki Mai, published by Futabasha.
A manga adaptation by Chikage Nakagura, serialized on Futabasha’s Gaugau Monster website since July 24, 2020, has released seven tankobon volumes as of April 2024, with the eighth volume slated for release on December 25, 2025. Additionally, Comico’s Pocket Comics platform offers a full-color, vertical-scrolling English version of the manga, making the story accessible to a global audience.
Comico’s Pocket Comics describes Betrothed to My Sister’s Ex's story:
Marie has spent her life living under her sister’s shadow as the two grew up in an impoverished baron’s home. Every nice thing went to Marie’s sister, leaving her without even a proper dress! And right when her sister was being married off to a wealthy Earl—tragedy strikes and Marie’s sister is killed en route. With the dowry already spent, it’s decided that Marie will take her sister’s place and become the Earl’s betrothed. But, when she gets there, she finds there’s been a serious mix-up—the proposal was a total misunderstanding! Can Marie win the heart of the handsome Earl, or is she destined to live a life without a single nice thing?
Sources: Official website & X account of Betrothed to My Sister's Ex anime
