One Punch Man Manga Chapter 15

Saitama accidentally punches Sonic in the groin with closed fist in One Punch Man manga chapter 15. Unable to dodge thanks to his extremely high-speed, Sonic is belligerently injured and retreats, vowing revenge. At the same time, Saitama is annoyed that he hasn’t registered as a hero yet, and chooses to become a part of the Hero Association with Genos as his disciple.