is a Japanese manga series written and illustrated by Rocomi Maruo. It was originally published as a webcomic on the author's Twitter account in September 2023. It later began serialization on the Nico Nico Seiga website in November 2023, with its volume releases handled by Square Enix.
Synopsis Due to his narrow-eyed appearance, most people suspect that Akiharu is a delinquent up to no good. However, in reality, he is a humble young man who deeply adores his older sister.
Characters /
Media Manga Written and illustrated by Rocomi Maruo, My Shady Little Brother, Gyomei was originally published as a webcomic on the author's Twitter account on September 1, 2023. It later began serialization on the Nico Nico Seiga website on November 7, 2023. Its chapters have been compiled into two tankōbon volumes under Square Enix's Gangan Comics Joker imprint as of May 22, 2025.
The series' chapters are published in English on Square Enix's Manga Up! Global app.
Other A promotional video was uploaded to Square Enix's YouTube channel on June 19, 2024. It featured voice acting from Kengo Kawanishi.
Reception The series was nominated for the tenth Next Manga Awards in the web category in 2024.
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