Episode 7

A No-Holds-Barred Eden (拳客のエデン, Kenkyaku no Eden) is the 7th episode of Kekkai Sensen anime.

Synopsis
Chasing down a rescue request from Zapp, Klaus and Leo find themselves in an underground cage-fighting arena, with Klaus winding up in the ring. Black and Leo hit it off over lunch at the diner, and learn that they have much in common.