That Undeliverable Letter ...President Aria leads Akari to a square with many cats, where she meets a girl wearing a belled collar who gives her a letter to deliver. In the morning, Mr. Mailman tells Akari the envelope contains an out-of-date format of video card but promises to locate the address for her. During gondola practice, Aria leads Akari to a canal she doesn't recognize, where the girl tells her the letter is important because it can "overcome time and space" and deliver messages to the heart, before being called inside a house as Ami. Mr. Mailman tells Akari that the address is of an abandoned terraforming base out in the middle of the Adriatic...