After Kouga's defeat, Muramasa becomes unstable, as he had absorbed hollows in order to sustain himself without a master. Many hollows spill forth from his body, and he transforms into a form similar to an Arrancar. Orihime tries to reach out to him to save him from his sorrow, but he attacks the group. Ichigo manages to slash through Muramasa, but he becomes even more unstable and becomes a larger dome-shaped mass, engulfing him in the process. The formerly rebellious Zanpakuto return with their owners to help Ichigo and his friends in the battle.
La traición de Koga hace que Muramasa pierda el control sobre todos los Hollows que absorbió para mantenerse y la situación empeora más cuando la Presión Espiritual atrae a todavía más Hollows a Karakura.
響河に斬り捨てられた衝撃から、村正の体に変化が生じる。これまで生きながらえるために捕食していた虚を抑え切れなくなり、暴走を始めてしまったのだ。村正は姿を変え、虚を吐きながら咆哮を上げる。
Byakuya riesce a sconfiggere Koga, ma Muramasa cade preda della disperazione per essere stato abbandonato dal suo padrone e si trasforma in una sorta di Hollow.
