The boyish Satsuki is so lonely she masturbates and dresses up in a bunny girl outfit with her large female friend for lots of cheating sex. On top of that, having made a big mistake... she gets punished with some anal violation.
The protagonist is a middle-aged man who likes spending his weekend in an internet cafe. One day he was hooked up with by a runaway girl and somehow had a physical relationship with her.
A guy who has a crush on his classmate is determined to confess his love to her on a field trip, but due to being too nervous he fails... Then, on that same night he ends up barging in on an orgy party where she is a participant!
In a future where only 1 in 10 children are born male. In an effort to prevent governmental collapse, a law is passed mandating that men must give semen three times a day.