A female student comes in to retrieve something she forgot after school. Everyone else has gone home, and she should be alone in the classroom. But there's a strange, janitorial-looking man there! Sensing something ominous in the air, the girl tries to leave the classroom. But at that moment, her worst-case scenario becomes reality. She is forcibly restrained, and the man thrusts his rough, thick fingers into her mouth. The girl desperately tries to hold back the rising stomach acid. Naturally, she can't even scream. To add insult to injury, a dildo and catheter are forced into her, and she vomits, her eyes watering... But it doesn't end there. Her innocent body is subjected to further deep throating and sexual assault. She loses control from fear she has never experienced before... In such a state of despair, she is strangled and her consciousness becomes hazy due to lack of oxygen... If this is what it's like, it would be better to just be raped. Why me... I just went to the classroom to retrieve something I forgot. That's all... While cursing my own bad luck, the girl also wishes this time would end quickly. However, there is no limit to the man's crazy desires, and the hellish times continue...