Bleach Episode 251 -

Byakuya’s grandfather and the Head of the Kuchiki clan at the time of Kōga’s fall.

Taking advantage of Kōga's inability to use his Zanpakutō, Yamamoto and Ginrei use special spears and Kidō to seal Kōga away, seemingly ending his threat for centuries. Bleach Episode 251

This episode serves as a flashback-heavy narrative that explains why was sealed away and the origins of Muramasa’s rebellion. Arc: Zanpakutō Unknown Tales (Filler) Key Focus: Kōga Kuchiki's history with the Soul Society. Byakuya’s grandfather and the Head of the Kuchiki