Higashigakure is a city in the mountains. There was a ceremony several thousand years old. To appease an angry God, men are going to participate in group sex with the woman assigned to the procedure. If the girl becomes pregnant, God is appeased and blesses the village with peace and a good harvest. If the girl does not become pregnant, she will be wrapped in straw soaked in semen and thrown into the river alive to be sacrificed to God. Nowadays the ceremony has not been forgotten... The debauched tradition continues in the hands of a secret organization, a sex club group that takes an active part in the life of Higashigakure's unique school. Motoko Tamura, begins his work as leader of the Sex Club group!