Mashiro is found writing an exchange diary during class by her disliked homeroom teacher, and is lectured after school. As the teacher lectures her persistently, Mashiro gradually becomes tense and begins to feel the need to pee. Reaching her limit, Mashiro wets herself. The teacher is unable to contain his excitement at the sight, and sucks her pee-stained panties, licks her pussy, and rapes her. Mashiro is then confined to the storehouse, where she is subjected to further abuse. Out of fear, Mashiro wets herself again.