Based on the adult game by Syrup: Many Milk. Demons are attacking earth, releasing a field that drives men to wild lust and absorbing the carnal energy that results in order to replenish their strength. Yuuri is chosen by Suzune-sensei to become an Angel Goddess and fight these creatures of darkness. When Suzune-sensei deems Yuuri capable enough to fight on her own, however, things begin to go horribly wrong. The demons have a new creature, capable of besting even an Angel Goddess. But the possessed men aren’t the only ones who want her, and her own gym teacher turns out to be a bigger threat and pervert than she could have dreamed. But she’s not the only one who’s been compromised…!

If you manage to stay a virgin till you are 30 years old you will become the next family head. However, the candidate for the next family head Teshirogi Naoki was being tempted by the women surrounding him. Will he be able to go through many trials and become the head of the family…?!