Set in a world where humans co-exist with a branch of humanity called Beastmen, who face persecution for their ability to turn into humanoid animals through a trait in DNA called "Beast Factor". Centered on you, a young teenage who suddenly turned into a humanoid tanuki beastman after your best friend Nazuna Hiwatashi was abducted following a blood transfusion. You find yourself running away to seek refuge in Anima City, a haven made for the Beastmen.