Volume 9 of the wildly popular manga *My Little Sister Knows* by Mari Kanki, currently serialized in *Weekly Young Magazine* (Kodansha), will go on sale on October 6, 2026.
[Update] September 14, 2026: Information on Volume 9 of “My Little Sister Knows” has been added.
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Mari Kagi’s “My Little Sister Knows” Volume 9 Synopsis
I want to know more about that person.
Department Head Yokoo and Momi Tiger have confessed their feelings to each other. Gin’hiko, a coworker who’s taken an interest in Kiichiro.
All sorts of things happen again today around this brother-sister duo who live next door to each other—.
Volume 9 of the ever-entertaining sibling comedy.
© Mari Kagi / Kodansha
When is the release date for Volume 9 of Mari Kagi’s “My Little Sister Knows”?
Total sales have surpassed 1 million copies! Volume 9 of “My Little Sister Knows It,” the addictive sibling comedy by Mari Kagi, goes on sale Tuesday, October 6, 2026!
今日9/14（月）発売のヤンマガに #妹は知っている 88話「あらしのよるの男」が掲載されています。
よろしくお願いします！ pic.twitter.com/40TJU6Yy8c
— 雁木万里 (@yanuimori) September 14, 2026
Mari Kanki’s “My Little Sister Knows”: Synopsis (Recap) of the Previous Volume, Volume 8
Synopsis of the Previous Volume (Details on the Previous Volume, Vol. 8)
Boy-meets-girl stories happen all over the place.
A legendary postcard artist brother and his idol sister.
The brother tries an arranged marriage for the first time, while his sister, Miki, runs into her postcard artist friend, Momi Tiger.
Even her coworker, Hirose, has her first…?
Volume 8 of this sibling comedy where everyone’s encounters intertwine.
© Mari Kanki/Kodansha
Introduction to Mari Kanki’s “My Little Sister Knows”
My older brother is the legendary postcard artist, Fruit Parfait.
At work, he’s seen as a boring, expressionless office worker—Kiichiro Miki.
He stands out even at drinking parties and never seems to be having any fun.
But I, his little sister, am the only one who knows the truth—that he’s actually “the funniest and kindest person in the world.”
Volume 1 of this heartwarming sibling comedy that gently touches your heart.
© Mari Kanki/Kodansha
Mari Kanki’s “My Little Sister Knows” Volume 9, on sale October 6, 2026!
© Mari Kanki/Kodansha
| Retail Sites | [Amazon]Product Page [Animate]Product Page |
|---|---|
| Buy the Complete Series | [Amazon]Kindle E-book Bundle |
| Release Date | October 6, 2026 |
| Author | Mari Kanki |
| Price | 792 yen (tax included) |
| ISBN | ISBN-10: 4065452058 ISBN-13: 978-4065452059 |
| Information on the Previous Volume | Details on Volume 8 of “My Little Sister Knows” |
| Related Links | “My Little Sister Knows” Young Magazine Web Official Site |
“My Little Sister Knows” Manga Product Information
人気作品のキャラクターグッズ Anime Store.JP (アニスト) にて取扱中！
リアタイしてたら話題に上げてくださっててビックリ！
ありがとうございますm(_ _)m相田さんの貴一郎ボイス、最高なのでぜひ聴いてもらえると嬉しいです！#三四郎ANN0 https://t.co/PmQpy3PBXL
— 雁木万里 (@yanuimori) September 11, 2026
Please check the official website for details.
*Please note that the information in these articles may be out of date. We apologize for the inconvenience, but please check the official website for the latest information.
© Mari Kanki/Kodansha
