Sexless - Jimi Tsuma ga Furin ni Hashitta Riyuu

Mikami Riko is 34 years old and leads a sexless life. She is troubled by her husband Kiyoshi's reluctance to have sex at night. On the other hand, Gotou Toshiaki has a beautiful wife 10 years younger than him. He is also fed up with his sexless and loveless life. One day, at a school reunion, Riko meets Toshiaki, whom she had a relationship with when they were students. When Riko and Toshiaki tell each other about their dissatisfaction with their married life, they quickly become friends and it finally becomes a physical relationship. Although she is aware that she is doing something wrong, the relationship continues. Disappointed by her husband's lack of interest in having children, she soon awakens to a certain feeling. "I want to have children of my own. If my husband doesn't want to have a baby, then..." [Translated from DLsite]