Shoko is a strict teacher, but secretly she has a physical relationship with her student Takagi and enjoys secret affairs within the school. In the corner of the classroom, in the toilet, she stifles her voice while having sex with her student, finding it thrilling and becoming completely addicted. However, as their play escalates for more excitement, classmate Tsukagoshi catches wind of Shoko's relationship with Takagi. Shoko desperately begs him not to tell anyone, but Tsukagoshi smiles and says, 'If you don't want it to be exposed, do the same thing with me.'
