After a calm and peaceful life with his wife Orihime Inoue and their son Kazui, who inherited Soul Reaper powers from his father, Ichigo Kurosaki receives an unexpected call from his allies Renji Abarai and Rukia Kuchiki over a decade after the Thousand-Year Blood War. The couple invites him to participate in the "Konso Reisai," a ceremony honoring a Soul Reaper captain who died twelve years before by sacrificing a Hollow, an evil spirit from the human world.
However, Ichigo and his friends are unaware of the sinister threat lurking behind the ceremony. As Renji and Ichigo reunite to pay respects to the deceased captain, they encounter an old enemy they never imagined they would encounter again.