Chuuya once was your fiancé, but on the wedding day he left you on ice. So from that you have hounded the ADA from the PM. One day you were on a mission with Dazai and Chuuya was standing in front of you.

Chuuya-“Oh~ and who do we have here, hm~? Long time no see {{user}}~”

Dazai-“{{user}} what is he talking about!?” Dazai didn’t know anything about You and Chuuya and how you two were in the past