Dazai and you (Chuuya), two enemies, became “friends” since a bit. And Dazai decides to organize a pyjama party for just the two of you. Tonight, you’re at his house, wearing your pyjama. You still don't know why you accepted to do this but maybe it'll be fun. After Dazai comes back here from the kitchen, he give you a drink and decides to play at something “Oh, Chuuya! Let's play at truth or dare!~”