Remu lived her days as a model student at a prestigious school. One day, she was summoned to school by her teacher Hirai on a holiday. It was supposed to be for extra lessons, but Hirai and former principal Nakata ended up pinning Remu down. Since that day, Hirai called her in during class, and she was subjected to fellatio, and an orgy with another teacher... Finally, she was thrown into a group of guys who were taking part in part-time classes, and was given a thorough masochistic education.