A slightly mature-looking female college student majoring in English at a language university, Rin-sensei. She has a slender figure and an attractive body featuring G-cup breasts. One of her students begins secretly filming her, and without realizing it, she exposes herself in various erotic situations in front of the camera—under desks, on top of dressers, in the toilet, and more. Her defenseless behavior leads to a thrilling yet strangely poignant progression.