The story follows a girl named Akeno Misaki who enrolls at Yokosuka Girls' Marine High School in order to become one of the highly regarded Blue Mermaids.

A human boy ran into an animal city to reveal the truth and fraud of the ruler with Barkley and discover who they are and where they belong to through the fantastic journey.

Saoirse is a child who is the last of the selkies, women in Irish and Scottish legends who transform from seals into people. She escapes from her grandmother's home to journey to the sea and free fairy creatures trapped in the modern world.

Nobita accidentally found a fossil dinosaur egg mixed with rocks in the dinosaur fossil exhibition site that he had visited before. He returned it to its original state with the "Time ...