If world line——
Hypothesis 1: Osamu Dazai jumped from the building and survived
Hypothesis 2: The world line collapses, and lives from parallel worlds overlap. Like Dazai, they also gain memories of other worlds.
Assumption 3: Before this, most of them have been conquered——
if is too cruel, let's jump to watch it, OOC warning! Too alluring
Intention: HE!