The upcoming anime adaptation of Ghost Mikawa’s light novel series, My Friend’s Little Sister Has It In for Me! (Japanese: 友達の妹が俺にだけウザい, Tomodachi no Imōto ga Ore ni Dake Uzai), also known as ImoUza, has unveiled a brand-new teaser trailer and visual, stoking anticipation for its October 2025 premiere. The visual highlights Iroha’s playful and teasing nature, while also showcasing the core cast of the romantic comedy series.
What’s the Story?
The story revolves around Akiteru Ooboshi, a high school student who considers himself quite ordinary. His life takes an unexpected turn when he gets entangled with Iroha Kohinata, his best friend Ozuma’s younger sister. Iroha constantly teases and pesters Akiteru, turning his peaceful days into a series of “troublesome situations.” The plot thickens when Akiteru is tasked by his uncle to act as the boyfriend of his cousin, Mashiro Tsukinomori, in exchange for supporting his game development group, leading to even more complicated and humorous interactions.
New Teaser Trailer and Visual Released!
A second teaser trailer and a new key visual have been released, offering fans a glimpse of what to expect from the anime. The trailer previews the characters’ voices and showcases Iroha’s mischievous personality, while the visual highlights the main cast.
Release Date
The My Friend’s Little Sister Has It In for Me! anime is scheduled to premiere in October 2025 in Japan, specifically on the NUMAnimation programming block on TV Asahi and its affiliates, as well as on BS11.
Production Staff
The anime is being produced by studio BLADE, with a talented team behind it:
- Director: Kazuomi Koga (Rent-a-Girlfriend, Hokkaido Gals Are Super Adorable!)
- Series Composition/Scripts: Toko Machida (Lucky Star, Wake Up, Girls!)
- Character Designer: Katsuyuki Sato (Hokkaido Gals Are Super Adorable!, My Stepmom’s Daughter Is My Ex)
- Music: Tsugumi Tanaka, Kaho Sawada, Kanade Sakuma, and Hanae Nakamura
Meet the Characters & Cast
The anime features a vibrant cast of characters, with the voice actors from the drama CD adaptation reprising their roles:
- Akiteru Ooboshi voiced by Haruki Ishiya
- Akiteru is the main protagonist, a second-year high school student who sees himself as an average student with a hidden side.
- Iroha Kohinata voiced by Sayumi Suzushiro
- Iroha is Akiteru’s best friend’s younger sister. She’s a bright, kind, and beautiful honor student, but she’s also an excitable person who often teases Akiteru. She aspires to become a voice actress.
- Mashiro Tsukinomori voiced by Tomori Kusunoki
- Mashiro is a second-year high school student, classmate, and cousin of Akiteru. They were childhood friends, but she now displays a cold demeanor towards him. She is also a popular novelist under the pen name Namako Makigai.
- Ozuma Kohinata voiced by Soma Saito
- Ozuma is Iroha’s older brother and Akiteru’s best friend. He’s a kind and caring person, described as “beautiful like a prince,” and is a genius programmer.
- Sumire Kageishi voiced by Kana Hanazawa
- Sumire is Akiteru’s teacher, known for her ruthless guidance and sharp tongue. She secretly works as an illustrator under the pen name Shikibu Murasaki.
- Midori Kageishi voiced by Reina Kondo
- Midori is Sumire’s younger sister and a member of the theater club.
Light Novel and Manga
My Friend’s Little Sister Has It In for Me! began as a light novel series written by Ghost Mikawa and illustrated by Tomari. SB Creative has been publishing the series under their GA Bunko imprint since April 2019. As of March 2025, eleven volumes have been released. J-Novel Club licenses the light novel in North America.
A manga adaptation by Hira Hiraoka has been serialized in Square Enix’s Manga Up! online web service since December 2019. As of March 2025, nine tankobon volumes have been compiled. Comikey and Square Enix publish the manga in North America through the global version of Manga Up!.
Where to Read
The light novel series is available in English through J-Novel Club. The manga adaptation is available through Comikey and Square Enix’s Manga Up! service.
A Long-Awaited Adaptation
The anime adaptation was first announced in January 2021, during a livestream for the “GA Fes 2021” event. After a few years of waiting, fans can finally look forward to the anime’s premiere in October 2025.
Plot Details
Akiteru is approached by his uncle with a proposition: he must pretend to be the boyfriend of his cousin, Mashiro Tsukinomori. In return, his uncle will provide support for Akiteru’s game development group. Akiteru accepts this proposition, leading to complications with Iroha, who relentlessly teases and bullies him. The story explores the dynamic between Akiteru, Iroha, Mashiro, and other girls who enter his life, creating a blend of comedy, romance, and slice-of-life situations.
