Four years have passed since the initial outbreak of the Unknown virus epidemic, and the terrifying plague which depopulated the Tohoku region of Japan has been reduced to a mere memory, thanks to drastic quarantine measures coupled with an effective vaccine. But the Unknown virus is not dead yet and soon, very soon, an unescapable doom will fall upon Wataru Ayase and his family and friends, trapping them inside the “Hell on Earth” madhouse which originally was their home city, Tokyo…

Kansen 2 (like the first episode) takes place during the initial outbreak of the Unknown virus epidemic, but the protagonists here have a much harder lot because they are stuck in the middle of a contaminated city immediately after its destruction by a mysterious cataclysm. Stalked by hordes of infected maniacs, Hiroshi Ookura and his friends seek safety inside a mostly intact shopping mall, but madness and death are everywhere…

Extracurricular club activities are the norm for Japanese schools, but an all-night movie event scheduled at school and in August still sounds strange/unusual, especially considering the tiny size of the Movie Research Club (merely six students). And indeed, the two teachers supporting this novelty have hidden motives/objectives, although also the six students themselves chose to participate in the event for personal/secret reasons…

Even though Masaru is about to graduate from a technical college pretty soon he still has no job. One and only pleasure for him is to spend time at a cafe called “Hidamari”. The cafe is owned by his childhood friend’s Nanami and Kurumi’s parents and they are working there too. One day, he learns another one of his childhood friends is coming back to his town. He says “I wanna meet her soon.”. Triggered by his word, Nanami and Kurumi start to approach him in a very different way than they ever did before…

Urara starts working at a girls’ school. She is now happy because she will get married in a few months. But one day, her fiance suddenly goes missing since his business didn’t go well. Months later, Yuji, a debt collector, comes to her house, but she doesn’t have enough money to pay. Yuji offers her to work at a boys’ school his friend works. He also says if she works there for a month, she won’t need to pay back money. She finally decides to accept his offer without knowing the fact that the school is full of evil teachers and students…

A cross over between the two hentai RIN×SEN and RAN→SEM. The story starts with Urara still being abused in the Kurodou institute. One day she is told by the headmaster that her fiancee, the one that set her with a great debt and only her body to pay for it, has been seen in the Believe lab. Luckyly, two lecturers at the lab, the Ichinose sisters Riko and Anna introduce Urara to the lab master, Majima. Then in a luxurious and grossly decorated room, Majima can’t stop licking his lips ogling the sexy Urara. He tells her she being chosen by god, and that she must enter the seminar to obtain answers. But, the seminar is a seminar in name only, nothing but free sex every day involving the poor Urara. One day Urara discovers the surprising reality from Riko’s mouth. The real name of her fiancee is Kaji, a lecturer in the Believe Lab. Furthermore, her senpai Asuka is also a participant in the lab. With a lascivious smile, Riko makes Urara jealous telling about Kaji having sex with Asuka. Urara walks into a playing room and sees Kaji and Asuka having sex. Urara screams in surprise and despair, in front of them she stutters back into a wall. With a misterious smile she finally breaks and murmurs ” Be… lie… ve…”.

After losing his father to a house fire and his bullied sister to suicide, Ryou Tezuka searches for possible leads to these seemingly unconnected incidents. His investigation reveals the names of three high school girls—Ayano Yukawa, a gravure model; Misuzu Inami, a public entertainment actress; and Rina Tsubaki, his sister’s close friend. His heart filled with vengeance, Ryou kidnaps the three girls and brings them into an abandoned building in the middle of a remote forest. He then proceeds to violate the girls individually in front of a live streaming camera, hoping to make them confess their sins to the world while uncovering the truth behind the destruction of his family.

After the disappearance of her sister and finding out she had joined a suspicious enlightenment group seminar, Riko enlisted herself into the course to find her but the only way to reach the same course as her was to rank up and the only way to do so was to help others release… that being through sex.

Raika’s brother died suddenly. She changed to her brother’s school (all-boy school), so she could to find why he committed suicide. Someone interferes with her and discovers her identity leading closer to the truth behind her brother’s death.

Three students are in a school late at night fighting supernatural enemies. As they are about to leave, they get attacked and trapped. Based off the Inyouchuu game.

It was just supposed to be a summer training…. Yuki is a caretaker of the baseball club. She and other members stay at a training camp on the isolated island now. But one day, a civil war breaks out. Male teachers leave the island to see what’s going on. However, they never come back. Several days later, they know that their ship is wrecked. Nothing to drink…. Nothing to eat…. They gradually lose their self-control…