Makoto, married for five years, was a bit troubled by his wife's drinking habits. Around that time, he started chatting with Yuri, who lived nearby, as their return times coincided. At first, their conversations were just mundane daily exchanges, but they gradually began to talk about their respective marriages, eventually venting their household frustrations to each other. Yuri revealed that her husband's night shifts had led to a decline in their intimacy, resulting in a sexless marriage. Although they were just venting, somehow Makoto felt lighterhearted. Suddenly, Yuri sent him a self-made video. Makoto was bewildered and confused, but also aroused. He eventually gave in to Yuri's invitation. Makoto, who had never cheated on his wife since their marriage, struggled with his conscience but ended up going to hear Yuri out. As a result, they fell into an affair. Despite knowing he should end it, Makoto found himself captivated by Yuri's charm. After maintaining this relationship for a while, a strange phenomenon began to occur...