A dull middle-aged man returns to his hometown for the first time in several years. He can't hide his surprise and excitement when he sees that his niece, who welcomed him back to her home, has grown into an attractive woman's body. What's more, when she asks him to take a bath with her, showing him her defenseless naked body, he no longer has the time to act as a kind uncle. Unable to resist her young body, he enjoys her beautiful breasts and buttocks to his heart's content, and they eventually enter into a forbidden relationship...