Teacher Chitose finds herself alone at home while her husband is away on a business trip. She asks her students for help replacing a light bulb, but when some of them accidentally enter her bedroom, they discover her lingerie. Overcome with excitement, the students devise a plan to rape her. With her husband gone for three days, the students mercilessly assault Chitose, tormenting her body beyond its limits. By the end of those harrowing days, Chitose's body and mind are filled with despair and pain.