Yuureitou - Vol. 7 Ch. 56 - Chest

[MangaDex]

 

[mimiresu]

Come to think of it, in the Fuhenboku(?) Author's mansion when Shinbanmushi fought the communist dudes, they said that he threw weak punches. Later on he showed aikido moves.

Yamashina was weak but he was trained aikido in police academy. I should've known