"You've got some nerve dozing off in my class." Our homeroom teacher, Ms. Ririko, was always strict with us students. I was the only one in the class who was serious about both my grades and my attitude, and she often praised me for it. I respected Ms. Ririko... I never imagined I would witness such a shameful act from her. One day after school, on an empty staircase, I stumbled upon Ms. Ririko enjoying herself, her love juices dripping, revealing her hidden side. From that day on, I became entangled in Ms. Ririko's exhibitionism on school grounds...