Based on the manga by Mizuhara Yuu.

Based on a game by Colors.
In a certain town, there were consecutive phantom assaults. Because the incidents were extraordinary, there was a rumor that a ghost or supernatural creature caused them. The students in Akitoshi’s school were frightened. One day, an unknown girl appeared in the school. However, all the students except Akitoshi thought they had known her. Feeling strange, he shadowed her in order to investigate her but he lost sight of her. At that moment, he heard the scream of a woman from the nearby material yard and went to the place where the scream came from. There he found the beautiful girl of the school, Mikage. Mikage was surrounded by monsters Yuragi (fluctuation), and she was hanging naked. Yuragi noticed Akitoshi and began to attack him. Then, the fighter, Ai, appeared and cut them down.
Akitoshi stared at Ai. What was her true character, an enemy or an ally?

Orphaned at a young age, her parents victims of a brutal double murder, Sawa was taken in by the detective assigned to her case. Not content to just watch as the imperfect justice system lets more and more criminals go loose every day, he decides to train her to be his instrument of justice. After all, who’d suspect a pretty college student of being a deadly vigilante!
Now she must decide between her allegiance to her guardian and her loyalty to her one and only friend, a fellow sword of justice.

This time, I’m gonna be the one to go in and do things to him while he’s sleeping…

Based on a game by Bishop.
Toudou Miyuki and Sanada Eiji are teachers in the same school and lovers. They had decided that they would preserve their chastity until they are married. However, Miyuki is assaulted and loses her virginity to Takuya, Eiji’s step-brother. Furthermore, it doesn’t stop there as Takuya turns his attention on the other female teachers one after the other.

Certain subjects being taught these days at college aren’t always on the curriculum…
Sex education is one of them! Here at our all-girls school, one male teacher takes it upon himself to best educate students in the ways of carnal knowledge. Using (and abusing) his authority, he lures the hottest students into his lair and has his sleazy way with them! In the the end, these girls will learn some lessons they’ll never forget.

“I will never give in to you, no matter what you do!”
Yukimasa appears in front of Ruka as they have a girls only session going on.
Suzune is unphased by Yukimasa, and keeps on caressing Ruka.
“Yukimasa, I did just as you said…”
Ruka is shocked by the words that come out of Suzune’s mouth…
“There’s not that many people that are as strong-willed as you are.”
Having fun, Yukimasa forces his meat stick into Ruka’s mouth that is wide open from shock…

It was the Taisho era. Mikagura Tokito was the director of a detective agency, which had solved a lot of cases. One day he disappeared, apparently involved in an accident. Tomoe, Shigeno, and Chizuru, who adored him, got anxious thinking about what had happened to him. Hearing that Shigeno’s elder brother had seen him at a church in a foreign country, they travelled there hoping to meet him again.
However, it was a dead body of a priest in a church which they found there. Furthermore, they found his arms had been cut off from his body. Because they thought his death had something to do with Tokito’s disappearance, they investigated the case. Suddenly they were attacked by men. Being involved in danger, they tried to find Tokito but will they find him?