If it's an ability, there has to be a 'who'. But you're right, I don't know who it could be. It must be someone in Yokohama, or else Dazai-san wouldn't have stayed there. I bet it's someone Dazai-san knows too.

Mmm...I wish at least one copy of Dazai-san would end up in this world. His input here would be useful.