A little fish Pai lives on a coral reef near the base of the evil sharks. Pai is trying to convince the inhabitants of the Reef that it is necessary to have a plan to protect themselves from sharks and to prepare for a possible attack, but no one listens. He tried to organize classes of self-defense, but no one comes and he has to learn martial arts himself under the guidance of a very old tortoise named Nerissa. And then a cheerful fish Rock appeared in the city, who invited local people to make a great show in the style of water representations of Cirque Du Soleil. All residents of the Reef are fascinated by Rock his art of dance, and they do not know that Rock is sent by the sharks to lull them and seize theirs home.