Three years have passed since my uncle died in a traffic accident. During summer vacation, I came with my father to the house in the mountains where Aunt Yukine lives. It's been a long time since I last met Aunt Yukine, but she hasn't changed at all... no, she's even more beautiful than before. Aunt Yukine's big breasts, wet with sweat, were dazzlingly shining in the setting sun, and I was transfixed. That night, I saw something I shouldn't have seen. Aunt Yukine and my father were lying together, sweating and seeking each other...