Sirens and Mermaid war. Mika, the Prince of the Sirens and Yuu, the prince of the Mermaids, both get caught and brought to a circus where they are forced into performing for humans, this is a story where the two of them-mortal loveemies (Lovers/Enemies) have to work together to escape to be free from the clutches of Kureto and his circus. Mika X Yuu, Mikayuu, Shinya x Guren