"Sleeping in my class? You've got quite the nerve." The homeroom teacher Riko-sensei, who also handles student guidance, is always strict with us students. In the class, only I have good grades and attitude, and she often praises me. The respected Riko-sensei... I never thought I would witness her lewd side. One day after school, on an empty staircase, I encountered the other face of Riko-sensei masturbating while dripping love juices. From that day on, I got dragged into her school exhibitionism...