During class, Mashiro is caught exchanging a diary by her pitiful homeroom teacher and is called in for a stern lecture after school. As the unpleasant teacher hurls bizarre remarks at her, Mashiro grows increasingly tense, feeling a rising urge to urinate. Reaching her limit, she can't hold it anymore and ends up wetting herself. Seeing her in this state, the teacher can no longer suppress his excitement, sucking up the urine-soaked panties and licking her pussy before raping her. Furthermore, Mashiro is locked inside a storage room and subjected to new acts of molestation. Amid fear and anxiety, she wets herself once again.