Maggi has transferred to a girls' boarding school in the new semester. No sooner than she has arrived, she has already had an enormous conflict with a group of girls called Purple Dolls. Among Maggi's teachers, Mr. Lau, a biology lecturer has accepted the challenge and started training the girls for the annual physical endurance competition. But when the roommates' spirit is escalating, Maggi is depressed by the destruction of her romance.