Hiroki, a nephew, decides to visit his relatives, Mr. and Mrs. Akai, during his summer vacation. He meets his aunt for the first time in several years, and finds her beautiful. Hiroki, who has admired her since he was a child, cannot contain his excitement. That night, unable to resist, he sneaks a peek at his aunt masturbating... His aunt notices his gaze, sees that he has little experience with women, and forces herself on him. This summer, Hiroki will have an experience he will never forget...