Playboy omega Mahiro wants to live his life to the fullest before the onset of his first heat. When Mahiro discovers that the shy, awkward alpha Yoneya likes him, he decides to fool around with him. But little by little he begins to think Yoneya's personality is attractive. However, Yoneya is the son of an elite alpha family, different from the world which Mahiro inhabits. Note: Includes the one-shot "Itetsuku Kosen".