A future society where humans and mermaids coexist.
Stefan, a regular office worker at a shipbuilding company,
is suddenly proposed to one day by Chao, a princess from the mermaid kingdom!!
This unprecedented proposal instantly spreads across the world,
and people claim, “Their marriage will establish friendly relations between humans and mermaids,” stirring up global attention.
Without understanding why Chao chose him, Stefan is swept along by those around him… and ends up getting married!
Life with Chao, who’s unfamiliar with the human world, is full of thrills and surprises!
But as he receives Chao’s pure and wholehearted affection,
Stefan slowly begins to feel warmth in his heart…
What will become of their love!?