Marguerite is 10 years old. One day, in the school bathroom, she notices a stain on her panties. And her stomach is swollen. Marguerite suspects what's happening to her, but she doesn't dare tell her friend Shan. Getting her period so young... it's too early! Fortunately, the explanations from her mother and Mrs. Salmon, the nurse, reassure her. Marguerite also discusses it with her friends. There are a lot of prejudices and taboos surrounding periods. Growing up is always a little scary, but when you know your body well, you realize that your it is extraordinary.