[COMPLETED] A group of teenagers went to an ancient castle on a school trip. After they entered a particular room, they all remembered their past life and the connections they all had with each other whether it be hatred, jealousy, care, or even love... "Was this our destiny?"

Ten years before the events of the manga series, a fateful encounter brings a professional bodyguard named Yukichi Fukuzawa and an arrogant boy genius named Ranpo Edogawa together. The result: the establishment of the Armed Detective Agency, an organization that takes on dangerous jobs even the police won't handle! P.S - This belongs to Kafka Asagiri not mine