Kotoko is a Little "Different" by shinachiku-castella - Adult Sex Game

Diligent and shy Kotoko Haruyama has a lot of expectations riding on her. Burdened by stress, she develops a strange habit. That is, whenever she realizes someone is looking at her lewdly, she reciprocates just a little, somewhat erotically... But her strange little habit gets bolder and bolder and... she eventually falls prey to the ploys of perverted men...