Bleach the Movie: Fade to Black (2008) on Netflix

Plot summary

A spirit energy explosion tears through the Seireitei after the Soul Reaper scientist Mayuri Kurotsuchi is attacked in his laboratory by two siblings armed with an amnesiac scythe. Rukia Kuchiki becomes their next target: her memories are erased, along with everyone's memories of her. In the World of the Living, Ichigo Kurosaki forgets her for a moment, but Kon, a modified soul, is untouched and reminds him. Kisuke Urahara cannot recall Rukia either. Ichigo and Kon cross into the Soul Society, where the captains treat Ichigo as a threat and no one knows his name. Rukia wakes in the Rukon District remembering nothing of her life as a Soul Reaper, and the siblings claim the three once lived together and that she was going to name them.