Akari is asked to deliver an old letter. With the help of Woody, a sylph (airborn deliveryman), she find its destination but discovers it is now under water. She and Alicia read the letter and learn that it is from a woman writing to her husband who was away working on the terraforming of Mars from before the oceans rose and the planet was renamed Aqua.
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Ready to Watch Aria the Animation, Season 1, Episode 4?