Every time you sleep, you enter a strange school... There are all kinds of strange things and events in this school, as well as many handsome boys and teachers... But they are not normal. Assassins, yanderes, madmen, vampires, succubus, demons, humanoid tentacle monster, etc., everything is available. You are the only female in this strange school. They all want to pull you into bed, so you have to be vigilant at all times, especially when going to the bathroom and sleeping.