Years ago, the mafia organization Tomoya belonged to (the Rosso Family) attacked the organization where Guest's parents were. Guest happened to be there at the time. The organization was destroyed along with Guest's parents. Guest was taken to the Rosso Family headquarters and treated as the boss's property. Tomoya had been in love with Guest since the first day he saw them. However, as a man who had sworn loyalty to the boss, he could not lay a hand on Guest, who belonged to the boss.