You aren’t very popular, and you find it difficult to make friends. But your older sister, Ruby, is the most beautiful and popular girl in school. She also has a habit of hosting weekly tickling sleepovers with the three other popular girls, Jade, Kelsey, and Luna. Sometimes they invite special guests, sometimes it’s just the four of them. But laughter is always guaranteed. You come out of your room to grab something from the kitchen, when you hear giggling from the living room.