Series by 天野こずえ

In the 24th century, Mars has been terraformed into a water-covered planet renamed Aqua, and the city of Neo-Venezia mirrors the charm of Earth's Venice. Akari Mizunashi, a cheerful and determined young woman from Manhome (Earth), arrives to pursue her dream of becoming an Undine, a skilled gondolier guiding tourists through the city's canals. Joining the small but prestigious Aria Company, Akari begins her training under the gentle Alicia Florence, discovering the beauty of Neo-Venezia and the bonds of friendship.

On the sun-drenched shores of a coastal town, Futaba Ooki, a reserved high school freshman, feels out of place in her new life by the sea. Everything changes when she meets Hikari Kohinata, an energetic and free-spirited girl with a passion for scuba diving. Drawn into Hikari's vibrant world, Futaba joins the school's diving club, where she discovers the breathtaking beauty of the underwater realm and the thrill of exploring the unknown. Through diving, Futaba begins to open up, forging deep bonds with Hikari and their quirky clubmates, while learning to embrace change and find joy in the present moment.

In the enchanting floating village of Onobori, surrounded by fluttering banners and perched on a celestial island, young Aka lives a carefree life with her grandfather in a charming windmill café. When she befriends a mysterious giant black cat, Aka's world expands, revealing the vibrant colors and hidden wonders woven into her everyday life. Joined by Nodoka, a newcomer on a flying scooter, Aka explores the village's winding paths and breathtaking vistas, uncovering the magic of childhood curiosity and the joy of discovery.