Onslaught (S01E02)

Jugemu, armed with the ability to eliminate the regenerating monsters, is aided in his fight by a woman named Neo. Rinne probes them about who they are, the real essence of the monsters, and the "Master Orb" Jugemu referred to, but they remain tight-lipped. The following day, Rinne observes that Jugemu has begun to follow her around school.