A Sister's All You Need
A Sister's All You Need is a Japanese light novel series written by Yomi Hirasaka and illustrated by Kantoku. Fourteen volumes were published by Shogakukan under their Gagaga Bunko imprint from March 2015 to February 2020. Two manga adaptations have been published by Shogakukan and Square Enix. A 12-episode anime television series adaptation by Silver Link aired from October to December 2017.
Plot
The story follows the novelist Itsuki Hashima who is surrounded by various people, including a beautiful genius writer who loves him, a big-sisterly college classmate, a fellow male writer, a sadistic tax accountant, and his editor. As the story progresses, the underlying conflicts of dreams and goals surface, as each character attempts to achieve their dreams, in their own way. One such example is the rivalry between author Itsuki and his friend Haruto. Itsuki's stories are driven by a passion for stories about little sisters with praise from a selective yet strongly supportive fan-base, whereas Haruto's stories are driven by victory and romance through more common, yet popular cliches. Each of their stories is riddled with common light novel themes and concepts, such as romantic comedy elements and erotic illustrations. They are all looked after by Itsuki's younger "brother" Chihiro, who in fact is his younger stepsister.Characters
;Itsuki Hashima;Chihiro Hashima
;Nayuta Kani
;Miyako Shirakawa
;Haruto Fuwa
;Setsuna Ena
;Ashley Ono
;Kenjiro Toki
;Kaiko Mikuniyama
Media
Light novels
A Sister's All You Need is written by Yomi Hirasaka and illustrated by Kantoku. Shogakukan published the first volume on March 18, 2015, under their Gagaga Bunko imprint. The limited editions of volumes 4 and 7 include a drama CD.Yen Press have licensed the novels in North America. The English version is translated by Kevin Gifford.
Manga
A manga adaptation, titled Imōto Sae Ireba Ii @comic and illustrated by Idu, was serialized in Shogakukan's Monthly Sunday Gene-X magazine from December 19, 2015, to July 19, 2019. Shogakukan collected its chapters in nine volumes, released from May 19, 2016, to October 18, 2019.A spin-off manga by Kobashiko, titled Imōto Sae Ireba Ii Gaiden: Imōto ni Sae Nareba Ii!, was serialized in Square Enix's Gangan Joker from October 22, 2016, to February 22, 2018.
Anime
An anime television series adaptation, directed by Shin Oonuma and produced by Silver Link, aired from October 8 to December 24, 2017. Author Yomi Hirasaka wrote the scripts, Sumie Kinoshita designed the characters, and Tomoki Kikuya composed the music. The opening theme song "Ashita no Kimi Sae Ireba Ii" was performed by ChouCho, while the ending theme song "Donna Hoshizora yori mo, Donna Omoide yori mo" was performed by Aira Yūki. Crunchyroll streamed the series with Funimation produced an English dub. Following Sony's acquisition of Crunchyroll, the series was moved to Crunchyroll. Muse Communication licensed the series in South and Southeast Asia.A series of six short episodes, titled were uploaded to the anime's official Twitter account, following the broadcast of the anime television series, from October 9 to December 10, 2017. Each episode is two minutes long with super deformed characters.