My Friend's Little Sister Has It In for Me!

, or ImoUza!, is a Japanese light novel series written by Ghost Mikawa and illustrated by Tomari. The series began publication by SB Creative under their GA Bunko imprint in April 2019. The light novel is licensed in North America by J-Novel Club. A manga adaptation by Hira Hiraoka began serialization online in December 2019. An anime television series adaptation produced by Blade aired from October to December 2025.

Plot

The series follows Akiteru Ōboshi, an ordinary student who is best friends with his classmate Ozuma Kohinata. Iroha, Ozuma's younger sister, often hangs out at his house and acts annoying towards him, a contrast to her in-school persona as a kind and diligent honor student. One day, he is asked by his uncle to start a relationship with his cousin Mashiro Tsukinomori in exchange for him providing support for his game development group, which they call the 5th Floor Alliance. Meanwhile, Iroha aims to be a professional voice actress, providing the voices for the 5th Floor Alliance's work, but does so in secret due to her family's disapproval of her interests.

Characters

Main characters

Akiteru is a second year high school student. In the series, Akiteru calls himself a well-rounded average student but still has a hidden side to him.

Iroha is Akiteru's best friend's younger sister. In the story, Iroha is a bright, kind, and beautiful honor student. She is described as an excitable person who also acts clingy towards Akiteru. She aims to become a voice actress. When she was in junior high school, she was on bad terms with Ozuma and was a loner, with only her dream of becoming a voice actress pushing her forward, despite her mother's disapproval. However, after meeting Akiteru, she opens up and gets into voice acting.

Mashiro is a second year high school student, classmate and cousin of Akiteru. She is childhood friends with Akiteru and often played with him when they were younger. In the story, Mashiro is described as a gentle person when meeting strangers with a cold demeanor towards Akiteru. She speaks in the third-person. She is also a popular novelist who writes under the pen name .

Ozuma is a second year high school student and Iroha's older brother. In the story, Ozuma is a kind and caring person. He is described as "handsome like a prince" and is a genius programmer. Ozuma is Akiteru's only friend and has absolute faith in Akiteru due to some past events.

Sumire is Akiteru's mathematics and homeroom teacher. She is described as a ruthless guidance and has a poisonous tongue. She secretly works as an illustrator under the pen name . She is often late in finishing her work, much to Akiteru's chagrin.

Reiku is a second year high school student. She is a sound engineer.

Midori is Sumire's little sister and the President of the Drama Club.

An idol and a famous editor at UZA Publishing, whose real name is .

A first year high school student. She is an influencer on Pinstagram.

Supporting characters

Mashiro's father and Akiteru's uncle. He is the president of the large entertainment enterprise Honeyplace Works.

Otoha is the mother of both Ozuma and Iroha.

Sumire and Midori's Grandfather.

Mashiro's mother.

Media

Light novels

The light novel series is written by Ghost Mikawa and features illustrations by Tomari. It is published by SB Creative under their GA Bunko imprint, with the first volume being released on April 15, 2019; eleven volumes have been released as of March 2025. The series is licensed in English by J-Novel Club.

Manga

A manga adaptation by Hira Hiraoka began serialization in Square Enix's Manga Up! online web service on December 13, 2019, and has been compiled into ten tankōbon volumes as of October 2025. The manga is published in English in North America by Comikey and Square Enix through the global version of Manga Up!.

Anime

An anime television series adaptation was announced during a livestream for the "GA Fes 2021" event on January 31, 2021, with the cast of the series' drama CDs reprising their roles. It is produced by Blade and directed by Kazuomi Koga, with series composition and screenplays by Touko Machida, character designs Katsuyuki Sato, and music by Tsugumi Tanaka, Kaho Sawada, Kanade Sakuma and Hanae Nakamura. The series aired from October 5 to December 21, 2025, on the NUMAnimation programming block on TV Asahi and its affiliates. The opening theme song is , performed by , while the ending theme song is , performed by . Crunchyroll streamed the series.

Episodes

See also

• Days with My Stepsister, a mixed-media project by the same author.
• Jishō F-Rank no Onii-sama ga Game de Hyōka Sareru Gakuen no Chōten ni Kunrin Suru Sō Desu yo?, another light novel series by the same author.
• Sotsugyō Album no Kanojo-tachi, a manga series written by the same author.
• Spy Classroom, another light novel series illustrated by the same illustrator.

Notes

References

External links