RATMAN

Shuto Katsuragi is a superhero otaku. Only problem is, he's too short and always getting teased for his height...especially when he tries to emulate his favorite superhero! To make matters worse, Shuto suddenly gets abducted and tricked into participating in some rather sketchy and super-villainous experiments! (Source: VIZ Media) — Description from AniList community (anilist.co).