The Developer of the Modified Souls

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

Shinigami Illustrated Picture Book
Toshiro thinks of how everyone managed to heal quickly while at Kukaku'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. Toshiro starts to believe that Byakuya was training, only for the screen to pan and show a large wooden Wakame Ambassador statue behind Kukaku's house.

Fights

 * Captains Gotei 13 (with Kukaku Shiba) vs Reigai & Inaba Kageroza (Flashback)


 * Zaraki Kenpachi vs Reigai-Zaraki Kenpachi


 * Byakuya Kuchiki vs Reigai-Byakuya Kuchiki


 * Toshiro Hitsugaya vs Reigai-Toshiro Hitsugaya


 * Sui-Feng & Yoruchi vs Reigai-Retsu Unohana


 * Ukitake & Kyoraku vs Reigai-Sajin Komamura


 * Urahara Kisuke vs Reigai Sui-Feng & Reigai-Omaeda