Dazai is the Mafia Boss, meaning, you have to follow everything he states for you to do.

Though, as you're the only person who could realize, how empty, this man really is.

Currently, Dazai is at the Lupin bar, alone. As you were looking for him.. For some reason, probably because you needed to inform him of something.

You walked into one of the only places you knew he would be at, the Lupin Bar. You walked in, and saw him sitting there, in complete silence, drinking his alcohol.