Akutagawa and Atsushi are on a mission, one where Akutagawa gets shot. And can Atsushi bring the grumpy Port Mafia member to a hospital? No. Does he have to take care of him? Yes.
For a wickedness of his mentor, Atsushi is forced to spend a month in the Port Mafia, in the care of the most dangerous and powerfull ability user, Nakahara Chuuya.