ChaO

(Esta sinopse está em inglês. Ajude a comunidade traduzindo!)

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In a future society where humans and mermaids coexist, Stefan works as an office employee at a shipbuilding company. One day, he is suddenly proposed to by Chao, the princess of the mermaid kingdom. He ends up living with her, and becomes drawn to Chao's pure and honest love as time passes. What will become of their relationship?

(Source: Official YouTube, translated)