Despite their differences in position, three men—the youngest senior executive of the Port Mafia, Osamu Dazai, the lowest ranking member, Sakunosuke Oda, and the intelligence agent, Angou Sakaguchi—gather at the Lupin Bar at the end of the day to relax and take delight in the company of friends. However, one night, Angou disappears. A photograph taken at the bar is all that is left of the three together. Fast forward to the present, and Dazai is now a member of the Armed Detective Agency. The Gu