Atsuki Nakajima has finally adjusted to his exciting life as a member of the Armed Detective Agency. Even during peaceful days, however, trouble always seems to find him and his friends. Atsuki and his rivals in the Port Mafia encounter each other in their daily lives in Yokohama. They keep getting caught in funny, unexpected, and often ridiculous situations. His whole journey is filled with lighthearted adventure, comedy, and entertaining interaction between characters.