In this story, the world we inhabit is known as Earthside, alongside other realms named Nosfertia, Heavenstia, and Eternalia. When Darknoids from Nosfertia began their invasion of Earthside, Heavenstia dispatched three Animanoids (beast-humans) to stop it. The protagonist, Touya, had believed he was an ordinary human but discovered he was actually a being from Eternalia. With the assistance of the three Animanoids, Touya fights to defend Earthside.