This is a spinoff OVA adapted from a mobile game nobody asked for, built explicitly to sell figurines. The entire premise, a mermaid racing competition interrupted by a giant frog, exists to justify shipping three different QR codes across three different toys, each unlocking a different ending. It knows exactly what it is: an elaborate merchandise tie-in masquerading as anime, and it commits to the absurdity hard enough that the joke lands.
A competition for the ages begins when actresses equipped with advanced mecha suits dive headfirst into the Mermaid Grand Prix, a tag team racing event with a massive cash prize on the line. What should be a straightforward competition quickly spirals into chaos as obstacles both bizarre and dangerous threaten to derail every participant's shot at victory. Giant frogs block the path. Cyclones rage across the track. The actresses must rely on quick thinking, teamwork, and their specialized gear to survive each round. The tone shifts constantly between high-energy action sequences and comedic moments as characters react to the absurdity unfolding around them. Camaraderie develops as competitors push through ridiculous challenges together, turning what begins as a race into something far more unpredictable. The OVA format allows for compact storytelling that doesn't overstay its welcome, delivering spectacle without requiring extensive worldbuilding exposition.