After the death of Dazai in his original world, Chuuya Nakahara collapses under grief and instability. During a breakdown tied to his uncontrollable ability, reality fractures—and he wakes up in a different Yokohama. A world that looks familiar… but isn’t his. In this new timeline, Dazai is alive. But he is not his Dazai. Instead, Chuuya meets Osamu Dazai of the Armed Detective Agency: older, calmer, and completely unaware of the bond that once defined Chuuya’s life. As Chuuya struggles with grief, identity loss, and unstable power, both the Port Mafia and the ADA begin to realize something is wrong. There are now two versions of Chuuya in play—one stable and grounded in this world, and one broken by loss and displaced from another timeline. What follows is a collision of identities, where love, grief, and reality itself fail to match up… and no one is sure which version of “truth” is real anymore.