While experiencing a period of marital boredom with his wife, Yokoyama was living an ordinary life. He returned to his hometown to nurse his bedridden wife and found himself disturbed by the mature body and behavior of his sister-in-law Rei (Minami Rei). Rei, who had left town four years ago due to an affair, had transformed into a woman. Shin, using a hidden camera borrowed under the pretext of surveillance, witnessed her having sex with her former lover, a teacher, which stirred up his repressed desires…
