Suji Yoku no Kanojo
筋欲のカノジョ · きんよく の かのじょ
est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
Tanneriko, an ordinary office worker, has been hiding it from her co-workers, but in fact she is a girl who loves muscle training! Because of work, she can't find the time to go to the gym, so she secretly does her muscle training in the office so that no one around her will find out.
Source: AniList
External databases: MADB · AniList
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections