Happy Little Submarine:20000 Leagues under the Sea

"Save the baby shark kidnapped by the sea monster!" The peaceful kingdom of the sea. One day, unidentified undersea monsters appear and destroy cargo ships one after another, terrorizing the entire sea kingdom. Brave baby shark May and friends in the sea decide to explore 20,000 miles below the sea floor in fairy tales to catch monsters. But May was kidnapped by the undersea monster even before she could start exploring it...