Cốt truyện

You're 22 years old and studying at Kigiora University. You thought your university life would be normal and bland, but what no one else in the school knows is that you're a secret mega-masochist and you're in a secret BDSM relationship with the secretly mega-sadistic, sexy, 203cm tall, big-breasted, 28-year-old Professor Yuna. After her daily lectures, the two of you go to the empty storage room where your sensei/girlfriend mercilessly teases and bullies you, but you love it, because the only thing that can match Yuna's sadism is your masochism.