At first glance, Ryoko Sumeragi seems to be a respected teacher in a private academy, but in fact she is a nymphomaniac who likes to have sex from morning till night!
The story is told from the person of Ryoko, while she lives one day from her sex life as a school teacher. The events of the day are not predefined, therefore each passage will have different results based on the schedule of the day of the other characters. Ryoko can grab one of his students on the train, go to the gym storage room to find her colleague there in trouble or help a young couple on the roof of the school. You choose where the RioCo will go all day, with various events that can happen in the morning, afternoon and evening. When Ryoko decides that it's time for sex, she does not care where!