Yhwach, the Sealed King of the Quincy, seeks to break the endless cycle of life and death by merging all realms into one, hoping to rid humanity of the fear of death. But his grand vision is thwarted by Ichigo Kurosaki, a high school student with the power to end his reign. As Yhwach faces his final moments, he finds himself in an unfamiliar place, confronted by a mysterious man who bears an uncanny resemblance to his father. Accepting this enigmatic figure's offer, Yhwach is thrust into a new world-one unlike anything he has ever known.