A young prodigy with a background in water-guiding who was scouted while attending middle school by a new up-and-coming water-guide company, Orange Planet. At first she had trouble socializing with others, but after becoming best friends with Akari and Aika, she made some progress. She becomes the first-ever Prima Undine in history to be promoted straight from Pair. As the new rising star and hope of the industry, she draws a lot of attention. Her nickname is “Orange Princess.”

She’s known as the best singer of canzone in the industry and works for Orange Planet as a Prima Undine. At one time, she was ranked as one of the “Three Water Fairies” along with Alicia and Akira. She has two extreme sides to her personality. One is that she’s a master of paying delicate attention to others, and the other is that she’s a total klutz. She is pressed by people who have a burning desire to listen to her beautiful voice, so she also performs as an opera singer. Her nickname is “Siren.”

Alice’s junior and a single undine working at Orange Planet. She has a calm, cute and gentle personality, but sometimes she demonstrates spontaneity by blurting out words she doesn’t even know the meaning of, such as “From Siberia!” to anyone she has just met. She occasionally speaks in a literary tone. Along with Azusa from Himeya, she worries about the newcomers hired by the prestigious business known as Aria Company.