Satoshi, a nephew, is staying with his aunt to study for his entrance exams. However, he can't help but notice his aunt, who is just as beautiful as ever and treats him like a friend, and he can't concentrate on his studies at all. When he is scolded for his attitude, Satoshi accidentally lets slip that he is still a virgin. "What?! You're kidding! Still a virgin? How sad! Well... how about I help you graduate (lol)?" After seeing the full extent of the tattoos that his aunt, whom he had admired, covers her entire body, Satoshi's admiration for his aunt grows even stronger and he becomes absorbed in adult sex...