Nitta helps Natsutsuki masturbate, even though he has never had an orgasm before, but he ends up cumming alone and the lunch break ends. Nitta is troubled as he remembers what happened earlier. Natsutsuki seems calm, but she reaches under the desk to Nitta’s crotch. As if to continue the lunch break, Natsutsuki lifts her skirt and invites him in. Nitta is so eager to make Natsutsuki cum that he reaches for her crotch even though class is in progress. They continue to play with each other’s genitals without being noticed, but Natsutsuki doesn’t cum again. Unable to hold back any longer, Natsutsuki grabs Nitta’s hand and hurries out of the classroom.

Based on the erotic manga by Shiwasu no Okina. Excitement unfolds as we follow a group of students and their teacher on a field trip, and they meet another group of students with whom their mutual desire overflows. After Miss Suomi and her students arrive at Yarimoku Beach, they encounter a horny group of local classmates and decide to conduct a special type of sex ed class.

They were always butting heads as #1 and #2 in the exam rankings... but it turns out they have a bit more in common than they realized...

Our protanogist can't help but masturbate 10 times a day every day of his life, truly a hero for the ages. Little does he know that in a separate world where semen empowers heroines to great heights, he IS actually a great hero. Once summoned to this world you can guess what happens to him afterwards.

It is said that an ejaculation following three days of abstinence feels akin to a heavenly ascent. Thus, the graceful maid Reika not only attends to her master Reiji's daily requirements but also manages his orgasm control. From the morning, Reika persistently teases Reiji's member, halting just before he reaches climax. After enduring such continuous teasing, what remarkable service will Reika offer on the anticipated third day...?

After the massive success with Iris and Aegis, a new member of royalty is assigned to the school. The Empress of the dragons is a problem child who looks down upon others races. After getting alone with our protagonist she comments on his sexual prowess and decides to have a piece of him herself.

When the protagonist's grandfather, who runs a plastic model shop, falls ill, he ends up taking over the business. A regular customer, busty plastic model otaku Risa, appears as a part-timer!

Kuroda drops by her geeky classmate's home whenever she likes to read his comics, but not without a fair trade. While she lounges in his room, he’s allowed to use her body.

Mako-chan Kaihatsu Nikki 2 is the continuation of the story of Makoto Himemiya. After getting caught masturbating by her brother Takeshi, he decided to give her the first-hand experience of having coitus before doing it with her new boyfriend. She has invited her boyfriend over to hang out, but Takeshi has other plans...

A group of castaways have found themselves on an abandoned island where a virus that makes those infected constantly aroused and will kill those who are infected if they don’t ingest semen. The only guy on this island is the guy who was bullied in their class. Ai who bullied him now has no choice but to have sex with him. Jealous, Yumi binds Ai and has sex with him in front of Ai. Even Akira who tried to suppress her sexual urges becomes captive to his semen. Can this group of students actually escape from this island?…

Three gals are crazy about Nanashi, a gloomy guy in class! The "innocent" gals' temptations leave Nanashi, who has no immunity to girls, in a state of confusion and arousal!

The manager of the baseball club, loved by the players... and also loves one of the players. However, she has caught the eye of some of the higher ups and just might be in over her head.

Tomoe writhes happily in the life guidance room, her student cums inside her and records her making a peace sign with a cute face: every night she has nightmares about it. Today, when she looks down on the students who look at her disgustingly, Nemoto appears, appearing in her dreams every night! Nemoto calls Tomoe to the observation room, but Tomoe expresses her disgust towards Nemoto, but when she comes face to face with Nemoto’s penis, she can’t help but get excited and kneels down…!

Our protagonist, wishing to return to the old days, goes back in time to get revenge on the girls who bullied him as a kid. His big sister Saki... and his classmates are definite candidates.... But how about his childhood friend, Sera...?

What started as a normal student life turns into a crazy sex fueled dreamland with every female he knows wanting a piece of him! In the end he lands himself in a foursome with all of the girls in question and doesn't even know where to begin!

Ichiro Tani loves hostess bars and spends the lion's share of his salary on them. One day, he was so drunk that he spent all the money of the company he worked for on girls. Ichiro decided to escape to the mountains. His car broke down during a heavy snowstorm, and he was forced to walk blindly and seek help. He soon found salvation in the Ishikan Inn. There, Ichiro met the widowed mistress Ryuri Munakata, her daughter Nakoto, and the lovely maid Ren. He did not change his habits and decided at all costs to subdue these sexy beauties...

Slowly the group of 4 started to drift... but by chance they are reunited, however this time in a different place... with a new girl that wants some of the action as well!

So we got this heroine, Umiaru Luna, just minding her own biz, getting off at her home station. Think: a total vibe of a deserted local train line, a station building so retro it’s practically fossilized, emptier than a decaf coffee pot at a morning staff meeting. But, she wouldn’t expected that an UB, Murakami Kazuya, pounces. This guy is creepier than a phone call with heavy breathing and about as welcome as a mosquito in bedroom. She’s got dragged into his plan, with no choice but to go along with him. They duo UB bring her to the spot, Hikari is there too. Now they’re both in this mess

Everything and everyone is just a toy to her. Playthings for her to use or destroy. This sad lonely fat kid is no different than an ant on the sidewalk to her... and after she found him sniffing panties in the restroom, she is never going to let him hear the end of it. Or so she thought...

Mako-chan Kaihatsu Nikki 4 - After Makoto Himemiya gets her virginity stolen from her by her brother, unable to give it to the man she loves... and worst of all it happens right next to him... through a closed door.