Just finished playing it, I'll give you a run down.
Games composed of 5 parts
Rape: Play as the student and rape the teacher, its kind of shit because it takes so long, both sides have ungodly amounts of health.
Molester: Rape a girl on a train, except in this case you are surrounded by passengers watching and the girl doesn't resist? Not sure if its actually rape when compared to the teacher.
Masturbation: Make the teacher masturbate
Chastisement: Spank the teacher
Counterattack: Basically the same as part 1, however in this case you are the teacher. Its an absolute fucking grind and takes up 80% of the game.
The teacher starts off naked and has to fight through 3 stages, each with 3 levels and each level has around 7-9 enemies. Enemies are tank as fuck but not as bad as the first one except for the bosses at the end of the stage. All of the enemies have unique attacks that they spam, some are entirely undodgable except for jumping which for some reason makes 90% of attacks miss. Literally the only way to stop the bumrushing students that charge you from far away is to jump, however it doesnt affect the jumping attack students and the first bosses, knee kick guy and YoYo girl. Basically if your surrounded by more than 2 enemies, due to the variety of attacks you're basically fucked due to stunlocking unless you power attack.
Finally the last enemy boss is the student you play at the start with the same move set. Which is to say not completely broken like any of the other students, just that he has the same amount of ungodly health you have. So basically he was easy as shit. After beating him you get an ending composed of subtitled pictures. The third last line says something in japanese that wasn't translated but I'll just sum up the ending:
Teacher: I've beaten your game, give me back my clothes
Student: sure thing
Student: Moonrunes
Student: I will sink it to the depths of the ocean where it will never rise up *while student holds camera up*
Student: so you better do what i say
And thats the fucking ending, god damn garbage didn't unlock fucking anything.
I feel like maybe hes talking about her social life, career or something but i just don't fucking know.
Also just want to say you need to run it under japanese compatibility to play and also change the keys by going into the Options and then keyboard. Otherwise you will have no idea what to do.