# A Sister's All You Need (妹さえいればいい。)
**A Sister's All You Need.** (妹さえいればいい。, *Imōto sae Ireba Ii.*), also known as *A Sister's All You Need*, is a light novel (Japanese young-adult style novel, often illustrated) series written by Yomi Hirasaka and illustrated by Kantoku.[13](https://yenpress.com/series/a-sister-s-all-you-need) The story follows a group of young light novelists, illustrators, and editors in Tokyo, centering on the little-sister-obsessed novelist Itsuki Hashima, and is known for pairing broad comedy with a detailed depiction of the light novel publishing industry.[1](https://animeuknews.net/2018/05/a-sisters-all-you-need-volume-1-review/) The series ran to 14 volumes and is complete,[3](https://fictionex.com/light-novel/a-sisters-all-you-need) and by the time of the 2017 anime broadcast it had surpassed 1 million copies in print.[2](https://www.bandainamco.co.jp/cgi-bin/releases/index.cgi/press/6071?entry_id=5491) A 12-episode television anime adaptation aired from October to December 2017,[2](https://www.bandainamco.co.jp/cgi-bin/releases/index.cgi/press/6071?entry_id=5491) and the series is licensed in North America by [Yen Press](https://www.edgepedia.org/yen-press) under the title *A Sister's All You Need.*[1](https://animeuknews.net/2018/05/a-sisters-all-you-need-volume-1-review/)
The story follows a group of young light novelists, illustrators, and editors in Tokyo, centering on the little-sister-obsessed novelist Itsuki Hashima, and it is known for pairing broad comedy with a detailed depiction of the light novel publishing industry[1](https://animeuknews.net/2018/05/a-sisters-all-you-need-volume-1-review/). A 12-episode television anime adaptation aired from October to December 2017[2](https://www.bandainamco.co.jp/cgi-bin/releases/index.cgi/press/6071?entry_id=5491), and the series is licensed in North America by Yen Press under the title *A Sister's All You Need.*[1](https://animeuknews.net/2018/05/a-sisters-all-you-need-volume-1-review/)
| Key fact | Detail |
|---|---|
| Original title | 妹さえいればいい。 (*Imōto sae Ireba Ii.*) |
| Author / illustrator | Yomi Hirasaka (平坂読) / Kantoku (カントク)[13](https://yenpress.com/series/a-sister-s-all-you-need) |
| Length | Complete at 14 volumes[3](https://fictionex.com/light-novel/a-sisters-all-you-need); Shogakukan's digital store lists 15 volumes available[4](https://e-comi.shogakukan.co.jp/books/094515070000d0000000) |
| English release | Yen Press, translated by Kevin Gifford; volume 1 released May 22, 2018, age rating 16+[1](https://animeuknews.net/2018/05/a-sisters-all-you-need-volume-1-review/) |
| Anime | 12 episodes, TV broadcast October–December 2017; scripts and series composition by Hirasaka, directed by Shin Ōnuma[2](https://www.bandainamco.co.jp/cgi-bin/releases/index.cgi/press/6071?entry_id=5491) • [5](https://www.zaikei.co.jp/article/20180101/419449.html) • [14](https://www.allcinema.net/cinema/pdf/360657) |
| Sales | Series total surpassed 1 million copies as of the anime broadcast[2](https://www.bandainamco.co.jp/cgi-bin/releases/index.cgi/press/6071?entry_id=5491) |
| Ranking | 10th place, bunko category, *Kono Light Novel ga Sugoi!* 2018[6](https://kakuyomu.jp/works/1177354054885969256/episodes/1177354054886455637) |
## Premise and characters
The protagonist, Itsuki Hashima, is a 20-year-old light novelist whose books all revolve around little sisters, a fixation that has nonetheless sold well enough for him to publish 20 titles in five years[1](https://animeuknews.net/2018/05/a-sisters-all-you-need-volume-1-review/). Shogakukan's own synopsis describes him as a "modern Pygmalion" striving day and night to create the ultimate little sister, surrounded by writers, illustrators, editors, and a tax accountant[4](https://e-comi.shogakukan.co.jp/books/094515070000d0000000).
The supporting cast is a circle of friends in the same industry[1](https://animeuknews.net/2018/05/a-sisters-all-you-need-volume-1-review/):
- **Nayuta Kani**, an 18-year-old award-winning genius novelist who fell in love with Itsuki after reading one of his books and repeatedly proposes to him despite his refusals.
- **Haruto Fuwa**, Itsuki's rival, who debuted around the same time and writes popular romance-driven novels; one of his series is already being adapted into anime, yet he remains jealous of Itsuki, whom he considers the better writer.
- **Miyako Shirakawa**, Itsuki's friend from college, a "normie" with no ties to the industry who acts as the grounded big-sister figure of the group.
- **Chihiro Hashima**, Itsuki's younger step-brother, who cooks and cleans at Itsuki's apartment and, per the publisher's synopsis, holds a significant secret[4](https://e-comi.shogakukan.co.jp/books/094515070000d0000000).
Much of the story unfolds in Itsuki's apartment, where the group plays board games and tabletop RPGs, drinks, travels, and discusses their work; the publisher's blurb lists tax filing season among their shared experiences[4](https://e-comi.shogakukan.co.jp/books/094515070000d0000000). Reviewers note that the series carries an age rating of 16+ in English, with crude humor and explicit illustrations alongside its industry drama[1](https://animeuknews.net/2018/05/a-sisters-all-you-need-volume-1-review/).
## Publication
The series ran to 14 volumes and is complete[3](https://fictionex.com/light-novel/a-sisters-all-you-need), although Shogakukan's e-comic store lists 15 volumes available digitally[4](https://e-comi.shogakukan.co.jp/books/094515070000d0000000). By the time of the 2017 anime broadcast, the series had surpassed 1 million copies in print[2](https://www.bandainamco.co.jp/cgi-bin/releases/index.cgi/press/6071?entry_id=5491).
Yen Press began releasing the series in English in May 2018, translated by Kevin Gifford, with the first volume running 187 pages and priced at $14.00[1](https://animeuknews.net/2018/05/a-sisters-all-you-need-volume-1-review/) • [7](https://www.fandompost.com/2018/08/21/a-sisters-all-you-need-vol-01-light-novel-review/).
The author, Yomi Hirasaka, is best known for his earlier series *Boku wa Tomodachi ga Sukunai* ("I Don't Have Many Friends," often shortened to [Haganai](https://www.edgepedia.org/haganai)), which was the best-selling light novel of 2011; he debuted in 2004 after winning the excellence award at the 0th MF Bunko J Light Novel Newcomer Award[6](https://kakuyomu.jp/works/1177354054885969256/episodes/1177354054886455637).
## Adaptations
**Anime.** A television anime adaptation was broadcast from October 8, 2017, airing weekly[8](https://shogakukan-comic.jp/news/8539) • [2](https://www.bandainamco.co.jp/cgi-bin/releases/index.cgi/press/6071?entry_id=5491). Unusually for an adaptation, the original author was deeply involved: according to the allcinema listing, Yomi Hirasaka handled the series composition and wrote every episode's script, with director Shin Ōnuma directing the anime[2](https://www.bandainamco.co.jp/cgi-bin/releases/index.cgi/press/6071?entry_id=5491) • [14](https://www.allcinema.net/cinema/pdf/360657). The opening theme, "Ashita no Kimi sae Ireba Ii." (明日の君さえいればいい。), was performed by Choucho[9](https://shogakukan-comic.jp/media/media_imotosae). The run ended with episode 12, "妹さえいればいい?", in January 2018, on an ending that left room for continuation[5](https://www.zaikei.co.jp/article/20180101/419449.html).
**Manga.** A manga adaptation, *妹さえいればいい。@comic*, with art by i~do~u~ and character designs by Kantoku, is published by [Shogakukan](https://www.edgepedia.org/shogakukan) under the Sunday GX label[10](https://sundaygx.com/work/1132/). A separate spin-off manga debuted in *GanGan JOKER* while the main adaptation ran in *Sunday GX*[11](https://laffey-ii.tina.moe/~tina/A%20Sister%E2%80%99s%20All%20You%20Need.%2C%20Vol.%205.pdf).
## Reception and themes
The series placed 10th in the bunko (tankobon) category of the 2018 edition of *Kono Light Novel ga Sugoi!*, the Takarajimasha ranking guide[6](https://kakuyomu.jp/works/1177354054885969256/episodes/1177354054886455637). English-language reviewers have highlighted its realistic portrayal of working authors, deadlines, editorial pressure, and sales rankings, comparing it favorably for readers who enjoy creative-industry stories such as *Bakuman* and *[Shirobako](https://www.edgepedia.org/shirobako)*[1](https://animeuknews.net/2018/05/a-sisters-all-you-need-volume-1-review/). A Japanese anime criticism blog made a similar point, arguing that unlike a comparable series it presents the light novelist's profession frontally, showing both its good and bad sides, while faulting the screenplay's crude humor and game segments as overlong[12](https://animentary.blog.fc2.com/blog-entry-278.html). The Fandom Post's review of the first English volume graded the content A− and the art A, calling it "a rewarding comedy with a heart" for readers who can accept its more outlandish elements[7](https://www.fandompost.com/2018/08/21/a-sisters-all-you-need-vol-01-light-novel-review/).
## References
1. [A Sister's All You Need Volume 1 Review, Anime UK News](https://animeuknews.net/2018/05/a-sisters-all-you-need-volume-1-review/)
2. [Bandai Visual press release on the TV anime of 妹さえいればいい。](https://www.bandainamco.co.jp/cgi-bin/releases/index.cgi/press/6071?entry_id=5491)
3. [A Sister's All You Need., FictionEX](https://fictionex.com/light-novel/a-sisters-all-you-need)
4. [妹さえいればいい。, Shogakukan e-comic store](https://e-comi.shogakukan.co.jp/books/094515070000d0000000)
5. [妹さえいればいい。 第12話（最終回）感想コラム, 財経新聞](https://www.zaikei.co.jp/article/20180101/419449.html)
6. [妹さえいればいい 感想, カクヨム](https://kakuyomu.jp/works/1177354054885969256/episodes/1177354054886455637)
7. [A Sister's All You Need Vol. #01 Light Novel Review, The Fandom Post](https://www.fandompost.com/2018/08/21/a-sisters-all-you-need-vol-01-light-novel-review/)
8. [TVアニメ『妹さえいればいい。』10.8より順次、放送開始, 小学館コミック](https://shogakukan-comic.jp/news/8539)
9. [妹さえいればいい。, 小学館コミック](https://shogakukan-comic.jp/media/media_imotosae)
10. [妹さえいればいい。@comic, サンデーGENE-X](https://sundaygx.com/work/1132/)
11. [A Sister's All You Need., Vol. 5 (Yen Press edition)](https://laffey-ii.tina.moe/~tina/A%20Sister%E2%80%99s%20All%20You%20Need.%2C%20Vol.%205.pdf)
12. [『妹さえいればいい。』アニメ批評, animentary](https://animentary.blog.fc2.com/blog-entry-278.html)
13. [A Sister's All You Need. | Novels | Yen Press, yenpress.com](https://yenpress.com/series/a-sister-s-all-you-need)
14. [allcinema.net](https://www.allcinema.net/cinema/pdf/360657)
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*Topic: Encyclopedia › Arts and culture › Literature and written works › Creative written works and worlds › Graphic, illustrated, and Asian-format fiction › Light novels and web novels › Light novel series and individual titles › Romance and school life light novels*
*Initially written Sep 17, 2026 · Reviewed: Sep 18, 2026; Oct 25, 2026 · Edited: Sep 18, 2026; Oct 25, 2026 · Last review: Oct 25, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license