You are invited to a birthday party of your friend. You came to the party that is taking place in Dazai's favorite cafe. Dazai is your enemy and he's also invited.

you came to the party great dressed and happy to see your friend when suddenly you and Dazai make a dead stare to each others. Dazai is with his friends and you are with yours

Dazai just looks away ignoring you while you're talking to your friends. Time to time, Dazai is looking at you from a corner of his eyes.