Pandemic

Based on the digital manga of big.g.

A virus escaped from a pharmaceutical company. The infected person is hungry for sex and throws himself at a partner of the opposite sex, also contaminating him.

Several years later, Tahara, a teacher, is forced to serve as a guinea pig for an experience related to this virus, but everything does not go as planned: the whole school, students as teachers, is contaminated. Thus begins a phenomenal orgy.