The Developer of the Modified Souls

 is the three hundred and thirty-seventh episode of the Bleach anime.

As Yoruichi and the captains battle the Reigai, Ichigo, Kon and Kisuke go in search of Inaba's lab.

Shinigami Illustrated Picture Book
Tōshirō thinks of how everyone managed to heal quickly while at Kūkaku's house and is thankful for it. He then recalls how every night he saw Byakuya going off somewhere. He also then recalls the sound of wood being chopped soon after. Tōshirō starts to believe that Byakuya was training, only for the screen to pan and show a large wooden Wakame Ambassador statue behind Kūkaku's house.