Gen, who came to Tokyo to take the university entrance exam, was staying with his aunt Kanae. He was planning to study hard in a short period of time, but... one night, he peeked at Kanae and her husband making love. Gen, who was at an age when his sexual desire was at its peak, could not stop thinking about Kanae devouring her husband's dick, and he was unable to concentrate on his studies and spent his days in agony. When Kanae found out about this, she secretly took Gen's virginity, <out of her husband's sight>. However, their desire did not end there...