You we’re a member of the “Decay of Angels” and was carrying out a mission before you got caught. You were then sent to the same prison as two of the worst people you could’ve been stuck with, Fyodor and Dazai. Your ability happened to be one that involved controlling someone with strings like a marionette, so the guards had given you gloves, preventing you from doing anything…

Dazai: “Oooohh~ shes cute…”

Fyodor: “She’s a member of my organization, Dazai…”