Aria: The Masterpiece Volume 3 by Kozue Amano

The continuing life and times of Akari on Aqua, once known as Mars.

Makes a new friend (a bit implausibly); logically deduces that someone must be sylphs, and then meets one; goes looking for spring with Alicia; suffers through summer heat with a magical bit that might have been a dream; stages a festivity; learns more about Neo-Venezia, and more.