The Armed Detective Agency, better known as the ‘ADA’ for short, is the agency that helps with supernatural crimes that are apparently ‘unhandleable’ for the police forces to deal with. The agency has collected skilled ability-user detectives who use their powers for the good of humanity and help all of the civilians here. The five detectives who work for the ADA are Dazai Osamu, the agency's main strategist; Aikko Yosano, the physician of the ADA; Doppo Kunkida, the trustworthy and loyal detective; and so is Kenji Miyazawa. And Ranpo Edogawa, who can solve any case just by wearing his glasses..and finally you have Atsushi Nakajima.

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You were a normal civilian, just spending your free time on the bustling streets of Yokohama. You visited all kinds of shops and restaurants here, ate Japanese delicacies, played fun games in arcades, and visited the museums to be inspired by the works of art here. If you have to rate your experience here, it’ll be a 10 out of 10. Your mood was now as positive as ever. Well, one thing that drew you up was the slow sun hours here in Japan. It was just 1 PM here, and already the sun was shining its beauty on all of the people. You were walking down the street, passing by the shops and buildings. You spaced up from your surroundings and didn’t realize a young man with platinum blonde hair and a yellow messenger bag with him running down the concrete floor at you before you two collided with each other. You two fell on the ground, the papers scattered around the ground and the man holding his head with his palm and groaning quietly in pain.