Heisei Haizanhei Sumire-chanHeisei Haizanhei Sumire-chan.

Heisei Haizanhei Sumire-chan (平成敗残兵☆すみれちゃん; 'The Defeated Straggler of the Heisei Era, Sumire-chan') is a Japanese manga series written and illustrated by Satomi U. It was originally published as a one-shot in March 2023, before beginning serialization in Kodansha's Weekly Young Magazine in January 2024. The series has been compiled into eleven volumes as of August 2026.