Based on the erotic game by Hibiki Works.

Kuroda shows footage of him fucking Rintarou’s wife, per Rintarou’s request. Kuroda tells Misako to meet him at a park one day. She disguises herself with a blonde wig and sunglasses as she heads towards the park. Kuroda tells her to get naked and he puts a vibrator in her pussy and makes her straddle a wooden horse as she sucks his dick. All of this is being watched by Rintarou…

Takigawa Hina goes to a locally famous all-girls school, and she’s my girlfriend. We’re both perverts, and our hearts are as one.
…at least that’s what I think, but there’s one thing she just won’t show me. In front of my very eyes, for me and for me alone, I want her to pee!!! In order to take our relationship to the next level, I’m going to rise to the challenge…!!

The depths of our planet hide a subterranean, magical world named Roa currently in the grip of a terrible war between the all-female knight corps of Queen Gloria and the monstrous troops of the evil syndicate Zerou.
The story starts when Metzer, a young and brilliant Zerou officer, gets official approval from Zerou’s high command to try a new plan suggested by the protagonist himself. Secretly relocated to the surface of Earth, his mission consists of gaining the trust of the Sweet Knights, the two japanese girls bestowed by Queen Gloria with the power to protect the surface world from the monsters of the syndicate. After discovering their weak points, Metzer will use his monsters to defeat, kidnap and brainwash the Sweet Knights into sex slaves devoted to Zerou’s cause.
However the syndicate do not know (yet) of Metzer’s great ambitions…

It is now the year 2010. The reprehensible and secret brotherhood known as the Last Molester Train has been driven underground once again, its three year reign of sexual predation extinguished under the militant ultra-feminist organization known as Raven Guard. However all is not yet lost. The Last Molester Train continued to search for a savior who could restore their patriarchy to glory, and at long last that man has been found. Revered under the pseudonym of Zin, this legendary molester defied the Raven Guard and defiled many a lovely flower under their watch. A single careless mistake is all it took catch him… but the brotherhood will not let a comrade-in-arms fall so easily.

Based on the adult game by Marine.
Kutaro works hard everyday at a TV station as an assistant director. However, his life changes when he agrees to take part in a new TV program with Aya — who is a famous TV presenter; but she constantly mocks him.
One day, Kutaro plots revenge by secretly adding his sperm into Aya’s coffee. She drinks it, not knowing, then after work she asked him: “What did you add to my coffee? It had a different taste.” He was embarrassed but admits it.
Surprisingly Aya responded with: “Today I felt great. I did not think such a coffee would help…”. Thus begins Kutaro’s life with a beautiful TV presenter.

Based on a doujin game by Orcsoft.
A successful businessman finds himself in the middle of a life crisis. His wife and daughter left him making him question the purpose of his hard work. A young woman suddenly approaches him one night and offers him sex for money. He discovers the joy of sex after being celibate for many years and realizes that age is not a hindrance to start a youthful adventure.

Based on the doujinshi by Kaisei Kishi.