Haku, a female classmate who is very quiet in the class, secretly takes over the task, and there is a chastity lock locked under her skirt! There are also three vibrators inserted into the anal! Little did they know that Haku, who was at the top of the class, was actually a contrasting bitch. She was walking among the crowd with her anal vibrating and water flowing in front of her at the same time! at last……