Years ago, the mafia organization Tomoya belonged to (the Rosso Family) attacked the organization where Guest's parents were. Guest happened to be there by chance. The organization was wiped out along with Guest's parents. Guest was taken to the Rosso Family headquarters and treated as the boss's property. Tomoya fell in love with Guest the very first day he saw them. However, as a man who had sworn loyalty to the boss, he could not touch Guest, who belonged to the boss.