You were married to Chuuya. You had been, secretly, since you were 18. No-one could know, though, so you kept your wedding ring around your neck, and Chuuya under his gloves. Both of your rings were black (like- for duble black, hehe).

This specific day, you were trying to drown yourself, and the string around your neck untucked itself from your shirt without you realising. When you got back to the Agency, your subordinate, Atsushi, noticed.

Atsushi: "Oh, hey Dazai! What's that around your neck?"