A Private Girls' High is a special school nurturing young maidens to be graceful, delicate intellectuals. Except that Class 1-A, infamously known as the "Class of Monsters," is full of bullies, blackmailers...

Hatori is an ordinary teacher leading an ordinary life at an ordinary high school. One day, he notices that one of his students, sumiko Tsumugi, is being bullied. On his way home from school, he ends up alone...