mysterious reiatsu explosion occurs in the vicinity of Seireitei in Soul Society, causing it to be destroyed. At the exact same time, a major change overwhelms Kuchiki Rukia, which causes her to lose something important inside. Urahara Kisuke sends Kurosaki Ichigo to Soul Society to investigate the disturbance. Upon reaching Seireitei, Ichigo is attacked by shinigami, once allies, who have no memory of him and Rukia. Now alone and on the run, Ichigo must find Rukia and uncover the cause of the mysterious incident before it's too late.