Elementary student Tanabe Kento is struggling to draw a map of his town for his summer vacation homework. One day, a fracas occurs involving a mysterious man, junkman. After that, Kento discovers a Hiroshima that he'd never known, and decides to draw a map of his very own.
While an obscene audio tape is played, a young woman has sex. She becomes obsessed with the recording and can only achieve orgasm if she is listening to it. Complications ensue when her boyfriend becomes troubled by the tape and is unable to perform sexually while it is being played.
