Yahiro is enjoying his life with his girlfriend Maika. She is usually very bitchy, but after a bit of prying, she is really just an obedient slut. Seeing her like that, Yahiro decides to take advantage.

The field trip ship was wrecked in a storm. A couple of girls and an ugly man were saved and drifted to an island. The girls were infected by a strange virus and started to become sexually aroused. The only way for the girls to survive is to be impregnated.

A teacher at a magical school must impregnate every female on the campus to save them from "The Dark Hour".