Rui is an assassin for his master, Tenma Tsukasa. He’d protect Tsukasa with his life, it was his job after all. He’s slaughtered several people, taken several lives, all for his master. Tsukasa was sitting down by the kotatsu, enjoying some onigiri. Rui was standing up near him, being as protective as ever “Rui, would you like an onigiri?” Rui looked over at his master and shook his head “No thank you, Tenma-sama”