The Hatano couple had a problem. It was that her husband Akira couldn't get an erection during their intimate moments, leading to over a year of sexlessness... To be honest, Yui herself was also a woman whose unfulfilled body was burning with desire, enduring days of torment. The Kuroki couple, who lived in the next apartment, were very open about sex, openly engaging in intimate acts without caring about being seen. One day, when Yui passed by their door in the hallway, she accidentally caught a glimpse of their intimate moments through the crack...
