Bleach

The Developer of the Modified Souls (15x21)

:

The captains and lieutenants of the Thirteen Court Guard Squads thought to have fallen in battle return to fight the Reigai. Meanwhile, Ichigo’s spirit energy and Hollow powers continue to grow unstable, forcing him to rest for the time being while Urahara and Kon continue there investigation on Inaba. Urahara and Kon later find out about Yushima Okouyo, the shinigami who created Inaba and Nozomi. When visiting Yushima's cell in the Maggot's Nest, they get attacked by the reigais of Soi Fon and Omaeda, but are later defeated by Urahara. The two visit Yushima's cell, only to find him unresponsive, leading Urahara to conclude that Yushima will never gain consciousness. Meanwhile, Ichigo's hollow side finally takes over and escapes the building he was in.