Yoruichi Shihoin continues to fight Tobiume and Haineko. Shunsui Kyoraku is attacked by both spirits of his Zanpakutou, Katen Kyokotsu. Jushiro Ukitake chases after Sogyo no Kotowari, trying to convince them to hand over their fans before he will play with them. However, as they seemingly agree, they use the chance to attack Ukitake. Kenpachi Zaraki attacks Tenken and Gonryomaru. Yachiru Kusajishi points out that the Zanpakutou spirits are not trying to kill Zaraki. Gonryomaru responds by saying that sometimes you win by simply avoiding defeat, angering Kenpachi. As Ichigo prepares to free Genryusai Shigekuni Yamamoto, he is attacked by Muramasa. As Yoruichi senses their battle beginning, she decides that there is something wrong with the way the Zanpakutou have been fighting her. Kyoraku also realizes that his Zanpakutou have been fighting defensively, while Ukitake thinks his Zanpakutou spirits are wasting time.
When Ichigo dons his Hollow mask to fight Muramasa, Yoruichi tries to leave the area where she had been fighting, but Tobiume stops her by collapsing part of the tunnel. Yoruichi decides that was the Zanpakutou's job to separate her and the captains from Ichigo. She traps them with Kidou binding spells and rushes to Ichigo, as do Ukitake and Kyoraku. Zaraki, however, stays put to fight his opponents. Muramasa goads Ichigo into using his most powerful Getsuga Tenshou, which he combines with his own power and redirects into the barrier surrounding Yamamoto, shattering it. Yamamoto reveals that Muramasa wanted to enter his inner world. To prevent this, Yamamoto set up a barrier and rendered himself unconscious. Muramasa reveals that he freed the other Zanpakutou and had them attack Seireitei to cause turmoil while he tried to figure out a way to break the barrier and access Yamamoto's memories, and that he manipulated them into helping him. Upon hearing that the Zanpakutou rebellion was just a front, Katen Kyokotsu and Sogyo no Kotowari attempt to attack Muramasa, but are incinerated by Ryujin Jakka. Ukitake asks who Muramasa is. Yamamoto explains that Muramasa is a Zanpakutou with tapeworm-like abilities, who enters his enemy's Zanpakutou and controls it as necessary, and it is imperative that he be stopped.