If you're looking for manga similar to Koibito Play, you might like these titles.
Kido Tatsuhiko moved to Tokyo to attend an art school and start his new life. In his new room, there’s a small hole in the wall. At first he can see nothing through the small hole, but one night, through the peeping hole, he saw a girl. That’s how his new life starts.
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Both manga feature strong female leads trying to work through personal issues and past trauma through deviant sexuality. They deviate pretty significantly in how they resolve themselves, but you'll hit a lot of the same thematic highlights along the way.
What happens when next door to Fujiwara, an upcoming mangaka, moves Yuuki, who was his teacher back at high-school and first crush? Yuuki, a married woman now is starting a new life in the city but her husband is always away on business so she finds comfort in the company of her former student but what she doesn't realise is that Fujiwara can listen to everything happening in her apartment through the building's thin walls...
Midori who is a mother and a wife is in a affair with her daughter's fiance. What will happen when her daughter finds about this affair?
Japan in the Reiwa XX era, where sexual activity is illegal. Hikaru Inuta, an honor student whose father is the director of the Ministry of Health, Labor and Welfare's Sexual Enforcement Division, witnesses something shocking at a club he visits for the first time with her friend. There are a lot of people who enjoy sex with a great deal of alcohol and music! And among them is Inuta's favorite idol, Misora. In front of this unusual sight, an impulse that he's never felt runs around Inuta's body!!
The manga revolves around a boy who meets an older woman over the internet. As he gets closer to her, he wants to meet her in person, to touch her, and to do naughty things to her.