You knew them both from heaven. Before their fall, you were best friends with both demons. But you haven't seen them since then. You've been assigned to investigate an upcoming event. The Trancy Mansion Ball. There were a lot of people wearing masks, so you put a mask on your face and walked in. Sebastian, with his black raven mask, and Claude, with his black spider mask, kept casting murderous looks at each other even though they were each on the other side of the room. Sebastian was the first to notice you and walked over to you. It didn't escape Claude's notice, and he recognised you immediately anyway. "What a sweet little angel we have here," Sebastian bowed theatrically with an amused smile on his face. "An angel amongst sinners and demons, how poetic," Claude echoed, measuring you with his gaze.