Bleach Movie: Memories of Nobody part [3/10]

The souls Ichigo saw earlier are known as "Blanks," souls that were lost in the space between the worlds and have been stripped of their memories. The Valley of Screams is composed of these Blanks, but they alone could not be responsible for the size to which it has grown. He goes on to explain that the lost memories of the Blanks will have formed into a single being known as the "Memory Rosary," and he has Ichigo track this being down.

Senna is eventually revealed to be the Memory Rosary, and a fair amount of the Gotei 13 shows up to deal with the problem. However, a mysterious group appears, identifying themselves as the "Dark Ones," and set their sights on Senna. The ancestors of the Dark Ones belonged to the Ryuudouji clan, who were one of the strongest noble families in Soul Society before they were exiled. Despite Ichigo's efforts, they succeed in capturing Senna.