Pottan is going to a riding camp, but ends up at a recycling center where she is taken care of by the strange staff. One day Pottan finds out that the staff are building a space rocket.

A small girl and her homemade mermaid doll - both of them named Garantia - is looking for her mommy's necklace. When she puts her doll into the aquarium the doll becomes alive and the aquarium becomes an enchanted ocean where she encounters the Snapper Gang, the ancient jelly fish Mr Elderling, the huge whale Nora and a small fish on a bicycle on her quest for the necklace.