Freeter Yamada, who only thinks about butts, had his niece Ena-chan staying over. Ena-chan doesn't listen to anyone and plays games all day long. She carelessly exposes her beautiful butt... Yamada can't hold back and buries his face in Ena-chan's butt... At first, she is surprised by the sudden act, but soon starts to enjoy it and even begins to tease him, demanding more and more... Their secret relationship began that day.
