Mao Hamasaki, who keeps a male masochist as a pet in her basement, becomes intensely interested in a flower shop worker she meets by chance, sensing strong M tendencies in him. Convinced he would make the perfect new pet, she forcibly captures and begins training him, adding him to her collection as her second subject. She affectionately refers to her original pet as Number One and the new flower shop man as Number Two, treating them both with meticulous care. However, as Number Two gradually awakens to his true masochistic nature, he begins to develop jealousy toward Number One. This evolving emotional tension deepens the narrative, delivering a powerful and intense impact to the viewer.