Yosuke is staying at his aunt Satomi's house while he is job hunting. Satomi is beautiful, kind and has beautiful breasts, so Yosuke admires her, but as he grows older, he feels his desire for her body growing. One day, Yosuke witnesses Satomi masturbating until she climaxes. Excited and different from usual, Satomi leans on him, saying "I'm lonely...". His young blood explodes as his aunt shows him a woman for the first time.