Detective Agency! Atsushi has rescued Kyouka Izumi, an unwilling Port Mafia assassin, but with a body count in the double digits, can Kyouka's crimes be forgiven? Meanwhile, a captured Dazai comes face-to-face with the man who detests him more than anyone else alive--his ex-partner in crime, Chuuya Nakahara! Can Atsushi and Dazai overcome their Mafia woes, or is the writing on the wall for both of them?