Aria

After 150 years of Terraforming, Aqua, the formerly planet known as Mars, now has more than 90 percent of its surface covered in water. A young girl named Akari Mizunashi arrives at the city of Neo-Venezia, an exact replica of the old Italian city of Venice, hoping to become an Undine, the most coveted job on Aqua.
(Source: TOKYOPOP)

Note: Includes one extra chapter.

Volume 1: Mizu no Miyako to Kanashiki Utahime no Monogatari (水の都と哀しき歌姫の物語) [story: Ayuna Fujisaki]
Volume 2: Shiki no Kaze no Okurimono (四季の風の贈り物) [story: Mari Okada, Ayuna Fujisaki, Tatsuhiko Urahata, Reiko Yoshida]

Extra chapter released in the Aria the Animation Perfect Guide Book. 

Extra chapter released in the Aria the Origination Perfect Guide Book. 

Extra chapter released in the ARIA The AVVENIRE Theater Pamphlet.

Extra chapter released in the ARIA The BENEDIZIONE Theater Pamphlet.

Extra chapter released in the ARIA The CREPUSCOLO Theater Pamphlet.

Extra chapter released in the Aria the Natural Perfect Guide Book. 

The quiet island town of Onobori is hidden from the world by a Noren — a traditional curtain that veils it from the ordinary. Here lives Aka, a gentle, innocent girl living in a windmill coffee shop with her grandfather. Life flows peacefully, until a chance encounter with a giant black cat draws her into a subtle, spellbinding journey. As moments of quiet beauty unfold around her, Aka begins to stitch together the vibrant threads of a future shaped by kindness, connection, and wonder.

(Source: Titan Manga)