To That Island Which Shouldn't Exist ... (その あるはずのない島へ ..., Sono Aru Hazu no Nai Shima e ...) is the fifth episode of the Aria anime and the fifth episode of the first season.
Summary[]
Akari receives an anonymous invitation to Neverland, with directions that send her to an island in the Adriatic. On the island, she gets lost but meets Aika and Alice following similar messages. Together, they find a secluded cove where they meet Alicia and Akira, who with Alice's mentor Athena sent the invitations, although the latter is missing. The three younger undines spend the morning in special training, which includes rowing unstable logs instead of gondolas to practice balancing.
After lunch, the five spend the afternoon in relaxed swimming, which Akari especially enjoys as the oceans on Manhome (Earth) cannot be swam in. When Akari loses a hair ribbon, she remembers a time she lost another hair tie while swimming when she was little. That night, while the others are asleep in a tent, Akari tells Alicia that when she was young she used to believe in Neverland, and that this beautiful bay on a human-created world must be another Neverland. Alicia tells Akari that important feelings are never forgotten, only buried, and after Akari thanks her she finds her lost hair ribbon in the water.