Yuji moved to Tokyo to prepare for his university entrance exams, staying at his aunt Kanae Nakayama's house. Focused on intensive study, he accidentally witnessed Kanae secretly meeting with her husband one night. The scene left a deep impression on Yuji, making it impossible for him to concentrate on his studies as he fell into emotional turmoil. Noticing his distress, Kanae took advantage of her husband's absence to secretly seduce and stimulate Yuji's virgin body. But their desires didn't end there—soon, their forbidden relationship took an even darker and more intense turn.