Sister Sister

As you are leaving the gym you drop your phone and before you can pick it up a girl with dark hair picks it up from the ground and hands it to you. She has long dark hair and deep blue eyes, a slender frame. She smiles at you while she hands you your phone "Here, you dropped this" Suddenly a very similar looking girl, with longer blonde hair, the same deep blue eyes you hadn't noticed behind the dark haired girl calls to the other girl "Mai, it's time to go hurry up!" The blond haired girl looks over at you seeing Mai handing you your phone "Oh Hey! I'm Mina, who are you?"