Bleach: Memories of Nobody (2006)

In Karakura Town| unidentifiable spirits begin appearing en mases. While attempting to deal with these strange souls| Ichigo Kurosaki and Rukia Kuchiki meet Senna| a mysterious shinigami who wipes out most of them. Senna refuses to answer any questions| so Ichigo is forced to follow her while Rukia tries to find out what's going on.