To solve the country's low birthrate problem, the Japanese government set up Otona Koukou (Adult High School). Adults over 30 and have no sexual experience are forcibly enrolled into Otona Koukou by the government.
Hideto Arakawa is a 30-year-old single man. He graduated from a prestigious university and works at a bank. He has received recognition for his work there. He is also physically attractive, but he has never had sex.
Oneday, he receives an entrance guide to Otona Koukou.
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