Menarche

After entering the water, Aijia swims a little faster than Xiangqi. They are best friends, but there are only opponents in the competition. Xiangqi's development is slower than that of Aijia. She is thin and wants to rely on the physical education quota to continue her studies. Girls have had their first menstrual period, their bodies have matured, and their minds have sprouted. Friendship and jealousy are arranged on the poolside. They take a big breath before the gun sounds, raise their arms after the whistle, and no one can look back in the blue water of youth.