Chihiro appears as Itsuki's younger step-sibling. Chihiro is a dependable person who looks after everyone and attends high school.~!It is later revealed that Chihiro is a girl.!~

Itsuki Hashima is a novelist who's hopelessly enamored with the idea of little sisters and is constantly surrounded by colorful characters. A world class genius and love-guru who's beauty almost seems a waste on her. A girl who's constantly troubled by her friendships, love interests, and can't even find refuge in her dreams. A ridiculously talented illustrator. Each of them have as many problems and worries as the next and they never have a dull day together as they play games, travel, and work together. From the same author of the famous I Don't Have Many Friends, Yomi Hirasaka!
 
(Source: Yen Press)

The story follows the everyday life of Itsuki, a novelist and "modern day Pygmalion" who works day in and day out to create the ultimate younger sister. He's surrounded by various other characters: a beautiful genius writer who loves him, his big-sisterly classmate from college, a fellow male writer, a sadistic tax accountant, and his editor. They're all looked after by Itsuki's perfect younger step-brother, Chihiro, who has a serious secret. 
 
(Source: Anime News Network) 
 
Note: The first episode received an early screening at a special event held at Shinjuku Piccadilly, Tokyo on 06.09.2017.

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**Non-anime roles:**
~!
- Ao in "Akatsuki no Yona" (Drama CD) (Japanese)
- Cosmo Hōjō in "Pretty Rhythm Rainbow Live: Kira Kira My☆Deco Design" (VG) (Japanese)
- Jane in "Granado Espada" (MMORPG) (Japanese)
- Kuu-chan in "Sei Madou Monogatari" (VG) (Japanese)
- Nagisa Shiota in "Ansatsu Kyōshitsu" (VOMIC) (Japanese)
- Nosuri in "Utawarerumono: Itsuwari no Kamen/Futari no Hakuoro" (VG)
- Ricotta in "Ys VIII: Lacrimosa of Dana" (VG) (Japanese)
- Rika Jougasaki in "Granblue Fantasy" (VG) (Japanese)
- Rika Jougasaki in "THE IDOLM@STER CINDERELLA MASTER 005: Rika Jougasaki" (Music/Drama CD) (Japanese)
- Yukimura Kusunoki in "Boku wa Tomodachi ga Sukunai" (drama CD) (Japanese)!~

Original "chibi" styled animations of Imouto sae Ireba Ii. posted on the anime's official Twitter.

Itsuki Hashima is a novelist who's hopelessly enamored with the idea of little sisters and is constantly surrounded by colorful characters. A world class genius and love-guru who's beauty almost seems a waste on her. A girl who's constantly troubled by her friendships, love interests, and can't even find refuge in her dreams. A ridiculously talented illustrator. Each of them have as many problems and worries as the next and they never have a dull day together as they play games, travel, and work together. From the same author of the famous I Don't Have Many Friends, Yomi Hirasaka!
 
(Source: Yen Press)
 
Note: Includes four extra chapters.

Original "chibi" styled animations exclusively on volumes of the Imouto sae Ireba Ii. Blu-ray/DVD.

Chihiro Hashima