| Set in the early 24th century against the backdrop of the city of Neo Venezia on the planet Mars. No longer the barren red planet, Mars has been flooded, inhabited and is something of a tourist hub for those looking for rest, relaxation and a gondola ride – the primary mode of travel in Neo Venezia. The Undines are professional gondoliers, tour guides for the people passing through. Akari Mizunashi is an Undine in training and this is a piece of her story. |
| Name | Character | Episodes |
|---|---|---|
| Erino Hazuki | Akari Mizunashi (voice) | 64 |
| Chiwa Saito | Aika S. Granzchesta (voice) | 62 |
| Ryo Hirohashi | Alice Carroll (voice) | 61 |
| Sayaka Ohara | Alicia Florence (voice) | 59 |
| Chinami Nishimura | Aria Pokoteng (voice) | 58 |
| Tomoko Kawakami | Athena Glory (voice) | 23 |
| Junko Minagawa | Akira E. Ferrari (voice) | 22 |
| Hirofumi Nojima | Akatsuki Izumo (voice) | 14 |
| Akeno Watanabe | Maa (voice) | 12 |
| Yuji Ueda | Udo 'Woody' Ayanokohji the 51st (voice) | 11 |
| Akeno Watanabe | Albert 'Al' Pitt / Maa (voice) | 8 |
| Yoshiko Matsuo | Akino 'Grandma' Ametsuchi (voice) | 8 |
| Akeno Watanabe | Albert 'Al' Pitt (voice) | 5 |
| Motomu Kiyokawa | Namihei 'Mr. Mailman' Anno (voice) | 5 |
| Ai Kayano | Anya Dostoyevskaya (voice) | 2 |
| Unsho Ishizuka | Café Owner (voice) | 2 |
| Yuichi Nakamura | Postman (voice) | 1 |
| Kenichi Ogata | Maestro (voice) | 1 |
| Chiwa Saito | Akina (voice) | 1 |
| Akemi Okamura | Agatha (voice) | 1 |
| Junko Minagawa | Aki (voice) | 1 |
| Akeno Watanabe | Aleph (voice) | 1 |
| Hiro Shimono | Man B (voice) | 1 |
| Fumihiko Tachiki | Old Man Apa (voice) | 1 |
| Megumi Toyoguchi | Amelie (voice) | 1 |
| Yoshimasa Hosoya | Man (voice) | 1 |
| Emi Shinohara | Woman in Mourning Dress (voice) | 1 |
| Tomoko Kawakami | Angie (voice) | 1 |
| Ryo Hirohashi | Anita (voice) | 1 |
| Ryo Hirohashi | Glass Shop Customer (voice) | 1 |
| Mayumi Izuka | Akatsuki's Mother (voice) | 1 |