Nao Satsuki, the new teacher who took over the class dominated by bullying students. Due to her strong sense of justice, she tried to protect the students who were being bullied, but that was a set trap. Nao Satsuki is drenched in liquid in the gymnasium, restrained with her legs spread wide and subjected to vibrator torture. She desperately tries to maintain her reason, but when the effect of the liquid appears, she can't resist the pleasure...