Kyoko, a young Japanese girl training to become a professional mermaid, is saved by her coach's mouth-to-mouth "kiss of life". Desire awakens within her, she finds her mermaid voice and discovers the devastating effects of her singing, which will lead her to face the other side of the world.
| Actor | Role |
|---|---|
 Arisa SasakiDeep Sea | Deep Sea |
| MMelina MardiniImagica | Imagica |
 Haruna MatsuiEternal Sunset | Eternal Sunset |
 Masahiro HigashideKotaro | Kotaro |
 Sei MatobuMiss Etsuko | Miss Etsuko |
 Kotone HanaseYokohama Blue | Yokohama Blue |
 Hanna MuroAshley | Ashley |
 Riku NakamuraRed Flame | Red Flame |
 Aki KigoshiFantasy | Fantasy |