Kenji is captivated by the beauty of Reika, who appears as a mother at his friend's house, and is determined to get her. Kenji sneaks up on Reika, who is defenseless and relaxed because he thinks she is his son's friend, and takes the opportunity to attack her. Taking advantage of the fact that Reika doesn't take him seriously, thinking it's just a child's prank, Kenji escalates the act. Gradually, Reika's body begins to feel pleasure from the caresses...