While incarcerated, fifth division lieutenant Momo Hinamori recalls her experiences at the Soul Reaper Academy, where she befriended Renji and Izuru. On a field trip to hunt hollows, she and her comrades were saved by captain Sōsuke Aizen and then-lieutenant Ichimaru when powerful hollows attacked. Back in the present, Hinamori knocks her guard unconscious and escapes from her cell, planning to confront the person who killed Aizen.