This is a world where beastmen who have evolved with certain characteristics from animals live. Overcoming the barrier of being herbivore and carnivore, the rabbit, Usami Kuroto, has become lovers with the wolf, Hoezaki Shirou. Cherished by the kind and quite overprotective Shirou, they lead a lovey-dovey life. But, Shirou's mom discovers their relationship…! An episode of them as young adults is also included."