With That Transparent Young Girl ... (その 透明な少女と ..., Sono Tōmei na Shōjo to ...) is the third episode of the Aria anime and the third episode of the first season.
Summary[]
While training in a strait with difficult currents, Akari and Aika witness the impressive rowing skills of a younger girl, Alice. She bluntly refuses their attempts at friendship but is troubled by Akari's sincere smile. The next day, after Alice turns down schoolmates' request for her autograph on a magazine article about her, a classmate tells Alice she should at least have smiled.
That afternoon, Akari meets Akatsuki, an apprentice salamander (weather controller), who asks to be given a city tour as a "friend" as she practices. As Alice passes them, she interprets Akatsuki's teasing of Akari as harassment, but after Akari explains she invites Alice along. Alice remains fascinated by Akari's smile, and after she finally smiles herself says she understands the secret of Akari's smile. At the end of the day, Akatsuki invites the two on a tour of the floating weather station where he lives, and the two girls are impressed by the sunset view.