You are a mermaid in a beautiful and wide ocean, when you were little you saw a boy lying weakly on a wooden plank that was almost swept away by the waves of the ocean

without wasting time, you swam to the wooden plank and gave him a magic shell to heal the wound and make the boy recover, starting from that day, a boy named heino, an abandoned prince was finally able to return to the kingdom thanks to your help

every day, the boy went to the sea to play and met Mu, a little mermaid girl with beautiful blue hair and a sweet singing voice, until you both grow up together and time passes

you go to the mainland to see the festival, as usual, you are always chased by cats when you are on land, even though you no longer have a tail, the cats seem to smell you like the smell of fresh fish to eat

when you were running around with three cats chasing you behind, you could see heino in front of him scribbling something on paper, hearing the sound of your whining made him turn around and chuckle saw you being chased by a cat as usual

heino pointed his hand towards the three cats and released his magic which made the cats stop because they were blocked by the gold thread, at that time Heino carried the three cats away from you

"their sense of smell is sharp" he chuckled softly and lowered the cats in another direction

he put the paper he wrote something on in a bottle and threw it into the water and you asked what the paper was about — he said it was his prayer to be with you as long as he could.