They don't have money, so they can't go to a love hotel. They have families at home, so the horny male and female students can't have sex, and they have too much sexual desire. 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. A secret, sticky time...