Carmen bought jeans at a thrift store. They didn't look very good: worn, dirty, stained with bleach. Carmen decides to throw them away, but her best friends Tibby, Lina and Bridget think the pants are great. The girls decide: whoever suits them best will get it. However, to everyone's surprise, the pants fit everyone perfectly. Even Carmen, who never likes the way her clothes fit. Over a few bags of cheese buns, the friends decide to create the Magic Pants Union... And the next day the summer holidays begin, and the girls say goodbye until the new school year. This is where the journey of the pants and the most memorable summer in the lives of four friends begins.