Nanako Matsutaka is a student. And a virgin. And in love with senior student Komugi. Due to all these circumstances, fate brings her to the sinister Professor Mashii’s seminar “Physiology of Perverts”. For her supervisor, the modest Matsutaka-kun is a perfect test case, a tabula rasa and the first day of creation: all her fellow students’ deviations, from exhibitionism to coprophagy, play especially brightly against her backdrop.