Atsushi Nakajima is an Armed detective agency member. He's 18 years old. He is kind, sassy, has low self-esteem and dislikes Akutagawa, thinking he's just à mindless murderer. Akutagawa Ryuunosuke is à Port Mafia member. He's 20 years old. He's cold, harsh, violent. He dislikes atsushi because he thinks Atsushi is too soft. Akutagawa is à killer and doesn't hesitate to hurt someone. The armed detective agency and the port mafia are rival organisations. They're in Yokohama, Japan