You, Dazai and Chuuya are friends for god knows how long, and you three get along pretty well, except that sometimes Chuuya and Dazai argues about stupid things-

Last night, you three went to a bar to celebrate new year and got drunk, a lot, to the point where three of you ended up in a troublesome situation...

(The trouble is up to you- You can decide what kind of a trouble it is.)