After his older brother Katsumi's sudden death, Reiji Naruse is forced to move back home and become the successor to a mafia family. He is placed in the care of a man called Kikuchi, with whom he starts his brand-new life. "I'll protect you. Even at the cost of my own life." Penetrated by Kikuchi's sincere gaze, Reiji finds himself falling for him......! Get ready for a hard-hitting yet sweet and chivalrous romance!!