The Hodono couple had a problem. Akira, the husband, couldn't get an erection during nighttime activities and they hadn't had sex in over a year... To be honest, Yui also suffered from an unsatisfied body, spending her days in torment. The Kuromaki couple living in the next apartment were very open about sex and weren't shy about public displays of affection, making them quite the lively pair. One day, as Yui passed by the shared hallway, she accidentally saw the Kuromakis' intimate moment through the door crack...
