Marnie Blue returns for another exciting year at Lady Sealia Foam's Mermaid School! This time,
Marnie and her friends are gearing up to compete in the Golden Glory Day competition--a
series of events that includes a fishball tournament, an obstacle course, and a seahorse race. In the past, the winner would receive the Golden Days Crown--but the crown went missing years ago, back when Marnie's aunt Christabel was still in school. But Marnie is determined to find the crown and swim to the rescue!