During a high-level conflict in Yokohama, 22-year-old Dazai and Chuuya are fighting an ability user whose power destabilizes space itself. When pushed into a corner, the ability user activates a final effect that forcibly overlaps incompatible timelines into a single point in reality. As a result, multiple versions of Osamu Dazai and Nakahara Chuuya—ranging from younger selves to alternate “Beast” versions—are suddenly brought into the same battlefield. The characters are confused and disoriented as they encounter alternate versions of themselves and each other for the first time. With no shared understanding of what is happening and reality continuing to destabilize, the situation escalates into chaos as the overlapping timelines begin to threaten the collapse of the entire space they occupy.