“Love Is A Number Of Keys” is a story about Jyun; living alone for the first time and becoming an assistant apartment manager. He soon finds out, by being a peeping tom mind you, that this particular apartment services sex to people. The ladies do this out of enjoyment, and Sumire (senior manager and A-class sex fiend herself) trusts him with this secret!

Based on the erotic game by Lune of the same name.

Yukiko is a young wife who is feeling lonely and unsatisfied. Her husband Kouichi won’t satisfy her needs, and in fact they sleep in separate beds. To add to her frustration, Yukiko finds some pictures on her husband’s cell phone – pictures of an unknown naked woman; also one night she sees her two children – who are not related by blood – together in bed.
Yukiko spends her time at home trying to satisfy her needs on her own. Until one day the father of her husband comes to visit and sees her in a compromising situation. That’s when things in her family start to change…

After having sex with his sister, Hiroki and Hitomi haven’t been having as much sex, so they decided to go to a love hotel. Hitomi puts on her old glasses for Hiroki’s sake. He puts lotion on her and asks for her to do some of the same for him. The next day, he goes to the pool with his sister, and finds himself getting aroused once again from glasses…

The hero is an “ordinary student,” Tsukui Shinichi, now in his senior year. A long-lost childhood friend, Ayase Aoi, moves in next-door and transfers into his school. Shinichi can’t quite remember Aoi, which upsets her quite a bit. Her good looks attract the attention of Shinichi’s comic sidekick, Yamashita Satoshi, and the school playboy, Kanzaki Kotoro. While Shinichi and Aoi spar over a potential relationship, Shinichi crosses paths with and then beds other students, including a clumsy genki girl, Fujiro Mami; an aggressive vamp, Ebina Mika; and the president of the Flower Arrangement Club, Hayama Reiko, before finally ending up in the arms of his destined True Love.

It seems that everyone is fighting over the main character Seiryu-kun’s genes!! They’ve even made a competition out of it! However, little do they know of the suspicious plot behind the whole situation. In any case this is a crazy school love comedy adventure! An adventure of an upperclassman and her friend trying to be impregnated!

Meanwhile, over at the hamburger shop, kinky things are transpiring. The manager likes to administer sexy punishments when his female clerks break the rules. Eventually, Masaru is invited to the party and finds a family affair waiting for him…

Childhood friends and lovers, promising each other to be together. She is a track and field star who pushes extremely hard to get a recommendation to the same school as her lover.
Unfortunately it looks like the ugly bastard of a track and field coach has been NTR’ing the fuck out of her, utterly destroying their dreams.