Hizumi

Hizumi is Japanese word that literary means "warp" in English. Like the word "warp" implies, the whole game is so twisted that it is impossible to happen. Basically, the game is about you, the main character, doing the same twisted thing everyday. You're constantly having sex with the girls in your class, teachers, mother, and friends. Having sex with girl is just like a normal exercise in game. Hizumi first starts with the main character [I don't know how to translate his name] having "fun" with his stepmother and ended next day still having fun with his stepmother. After the special "treatment" from your stepmother, who is no longer lving with her husband or your father, you went to school and have more fun with your classmates and teacher. During the break of each class, you will walk around the campus and talk to many people (mainly girls). If you went to the correct place at the right time, H-scene will follow afterward. After you got home from school, you will find yourself reading adult novel and all the sudden your stepmother came in and night excercising with you.

Hizumi is a game filled with twisted fantasy. Every event happened in the game is twisted. You would have fun with an OL (Office Lady) while taking the subway to school. You would get special couching from your teacher in her office. You would be invited to a "special group basketball training" from your friend. You would play a doctor-patient game with a girl you grow up with. And, the most twisted part of game is that you would have fun with your stepmother every day and night.

[from Anime Densetsu]