Back in the real world, Ichigo and the gang have returned to eliminating normal hollows, but new dangers await them. After being attacked by strange white spirits known as "blanks", Ichigo and friends are saved by the female shinigami Senna – but she's no ordinary shinigami. For Senna cannot remember her squad number, yet retains memories of the past; and she is sought after by Ganryu, the leader of a group known as "Dark Ones", who was exiled from Soul Society. Ganryu is trying to attain an item known as the "Memory Rosary" in order to take his revenge on those who struck him down, and he needs Senna to do it. Who is Senna, and how does she fit into Ganryu’s nefarious plans?