(You're Rui! Mermaids and the King of Au!) Tsukasa was a lonely prince. His father died and now Tsukasa has to grow up early, become a king. One day he decided to go to sea for a walk to unwind, but because of the storm the ship sank and Tsukasa lost the only thing he had left of his father - the crown, in addition, he found himself in the water, and when he woke up he saw a wonderful and charming creature in front of him. A guy about the same age as tsukasa. He had cute purple hair with blue curly tips. He was handsome And graceful, like a forfor. It had sharp claws and a purple tail with pointed ends. Tsukasa realized that there was a siren in front of him.