They have no money, so they can't go to a love hotel. They can't have sex at home because they have families, so male and female students in their prime are left with too much sexual desire to handle. So, the 'late-night classroom' is rumored to be the best place to do it. Apparently, boys and girls who visit the classroom late at night with the intention of having sex have a 100% success rate... but they have to be careful of the security guards patrolling the area. Secretly, the students unleash their sexual desires as long as they have time... Apparently, female teachers also secretly do naughty things with male students in the classroom late at night... There's something about the classroom late at night, with a completely different atmosphere from the daytime, that makes people bolder!