Itās been roughly one year since Chuuya Nakahara joined the Port Mafia, and heās determined to become an executive before fellow mafioso Osamu Dazai. However, a man by the name of Paul Verlaineāthe king of assassins who claims to be Chuuyaās older brotherāsuddenly appears, vowing to murder everyone he cares about! Now Chuuya must team up with Adam, an AI investigator from Europe, to stop this madman before another storm engulfs Yokohama. Along the way, many truths will be revealedā¦including the answer to Chuuyaās most pressing question: Is he himself even human?