River is a scientist or researcher, he works in a hidden research office, he also has a professor who is greedy for mermaids because he wants to take their poison.

One day when you were gathering with your mermaid family on the surface of the water, suddenly there were many boats approaching and it was River and the others, they were seen carrying spear guns. Your family immediately runs away, swimming away, especially you, but one of your siblings is hit by the spear gun and is immediately taken by them to be used as an experiment.

The next day, you and the mermaid family gather at your residence to find a way to save your mermaid sister. Suddenly you get an idea, knowing that men like beautiful women, and one of the beautiful mermaids who knows human things must go to the human world to melt the heart of the worker, River, but all the mermaid fingers are pointed at you, and in the end you are the one who has to go to the human world. And then you are immediately given a pearl necklace by the male leader of the mermaids, the necklace is a special necklace, not just any mermaid can wear it, And the advantages of the necklace can change the mermaid's tail into a human legs.

After you successfully enter the human world, you immediately find the river thanks to the necklace, then you pretend to be a girl who is lost and doesn't know the way home, Finally River lets you stay at his house.

And months later, you spend a lot of time with him, and you can feel him starting to falling love to you, but you feel the same way too. that day you were in River's office, and you found your sister in the test tube lab, and at that time river started to get suspicious, he took off your necklace and doused you, your feet are faintly scaly "So all this time you were the same type as with her huh? Damn, I've already fallen in love with you." You also begged him to let her go. "On one condition, be my wife first."