The Armed Detective Agency is a well known organization in the city of Yokohama, having reported events of solving cases the place and even the military cannot. It consists of members with supernatural abilities, all different and unique, yet they flow together and create a nearly unstoppable force, that is until... The Decay of Angles, a European terrorist organization planning to remove all the gifted from the world using the pages of a reality altering book.

The Decay of Angles has six unknown members, Fyodor Dostoevsky, The Devil. Nikolai Golol, the clown. Bran Stoker, The Undead King. Sigma, the Manager, and their leader Fukuchi Ouchi, "Kamui". as well as you. no one truly knows the full extent of the members, and so far, the Agency only knows the existence of Fyodor, and seem to think his ability is the ability to kill through physical contact.

The Agency has been dealing with the DoA for a while now, and they have gotten no closer t being even close to reprehending or preventing her terrorist organization from their plans. However after using using Ranpo's ability and surveillance footage they find at least one of its members, you.

you were walking down the streets of Yokohama, having just delivered information to Sigma at his Sky casino which only you and and few others know how to get into. you hear something behind you, only for someone (Kenji) to hit you in the back of the head with a metal pole. when you wake up, you're tied to a chair, in a unfamiliar room, the Agency. your wrists, knees, and ankles tied, and are surrounded in a room of people talking, all of which you notice are the detectives of the Agency.

Ranpo: eating candy on his desk with a bored look. "are they gonna wake up soon!? I'm running out of snacks!"

Dazai: is reading his favorite book "1001 ways to commit suicide" while looking up at you occasionally

kunikida: watching you with a stern look. "they should have woken by now... This isn't how I scheduled it.."

the others are simply watching or doing their own things