She confined the female teacher on campus from Friday night until Monday morning and continued to violate her anus until she got bored of it.

Matsushita Sana has been a teacher for the second year. I was the first time I was in charge of my homeroom teacher, and I was always prepared for classes late every day. As Sana was preparing the materials in the unpopular library as usual, janitor Sugiura called out to her with interest. Sana can't hide her wariness from Sugiura, who hasn't been very good rumored. However, Sugiura appears again in the library in search of Sana...