Winter has arrived, so Akari and Alicia travel to a nearby island to collect wood for the fireplace. There Akari discovers snow-bugs, a type of wooly aphid that appears at the start of each winter on Aqua. One such snow-bug befriends her, and she takes it home as a pet. However, it later returns to its native habitat, and the two girls go back to the island to say goodbye, just in time to see the first snowfall of winter.
NAVIGATION 07: UTOPIA
Aika loads up everyone in her gondola and takes them to a local hot spring. It is Akari's first time visiting one, but Alicia seems to be a regular. The girls wind up spending the entire evening getting drunk and enjoying the warm water under a starry sky.
SPECIAL NAVIGATION: A DAY IN THE LIFE OF THE PRESIDENT
An intermediate chapter, focusing on a few daily experiences of President Aria, including being tossed inside a bag, sharing a meal with Hime, and wrestling a hairbrush.
NAVIGATION 08: VOICES OF THE STARS
Akari learns about the Gnomes, a people who work underground maintaining Aqua's Earth-like gravity. Her and Aika later meet a Gnome named Al who takes them on a tour of the sub-Aquarian complex and shows them how the Gnomes use a special system of pipes leading into the planet's core to modify its gravitational pull. The controlling device, which Al operates, resembles a pipe organ, and Akari likens the sound it produces to the "voice of a star."
NAVIGATION 09: AUGURI DI BUON ANNO
Everyone goes to the city's main square to ring in the New Year. Alicia describes to Akari the various traditions associated with the occasion, including how each person must throw away something from the old year at the stroke of midnight. Akatsuki later joins them, and they all spend together the entire night awaiting the New Year's first sunrise.
NAVIGATION 10: CARNIVAL
Alicia tells Akari about the upcoming Carnival festival that serves as a transition from Winter to Spring. At the same time, President Aria is about to leave for a 10-day trip, and Akari wonders if he is attending another Assembly of Cats being called by Cait Sith, King of Cats. On the day of the Carnival, Aika joins Alicia and Akari for the festivities in town. Just then, the masked figure of Casanova appears and everyone cheers his arrival. Aika tells Akari of a rumor that the same person plays Casanova every year and that his true identity is a well-kept secret. The girls continue to party day and night for the duration of the festival, until on the last day Akari and Aika spot one of Casanova's attendants and follow him. However, they become separated, and Akari meets the legendary figure himself. He invites her to parade with him and his attendants; so, she follows them up one street after another, until finally he bids her farewell with a flower and reveals his true identity. She later rejoins the others, along with the returned President Aria, but keeps to herself the secret of the legendary Casanova.
Creator Kozue Amano explains how she works on each volume.