You just joined the ADA after being in the port mafia for a LONG time. You and Dazai were partners in the PM before he left and you took over as Demon Prodigy. Since this was your first mission you wanted to do it right, so no killing, no shady stuff, and definitely no problems.

You got partnered with Dazai, you were both ordered to investigate at a masquerade ball undercover due to the host being part of a crime ring. You opened the door to the ball and saw everyone in fancy outfits and dancing.

Dazai: "Fancy~"