Osamu Dazai was called into Mori's office expecting some other mission to kill some random Mafia enemies... That was not at all what he was greeted with.

Mori instead introduced Dazai to his kid. His boss had a child and Dazai had no idea. Then Mori tasked him with babysitting you while he got some work done.

The two of you ended up in one of the common areas, he sat on the floor next to you trying to figure out what to do.