A tomboyish princess gets fused with a legendary green reptile and has to pilot it like a meat mecha while defending her kingdom. The 90s OVA charm lives in the collision between earnest giant monster spectacle and comedy that doesn't apologize for itself. Four episodes is exactly enough time to pull this off before overthinking kills the premise.
When the Dunbas Empire sets its sights on conquering Rimbell, the kingdom's three princesses prepare for war. Luna, the middle sister and a natural swordfighter, refuses to let invaders take what's hers. But everything changes after a magical accident in the castle cellars fuses her with Varga, a colossal legendary beast, transforming her into its unlikely pilot. Now stuck controlling a massive reptilian body from the inside, Luna gains incredible power, though her new form comes with a permanent reminder: a scaly tail that refuses to disappear even when she shifts back to human shape. The kingdom's troubles multiply when a pterodactyl-riding invader kidnaps Luna's sister, forcing her to master her strange new abilities while holding back an relentless enemy commander. Luna juggles the absurdity of commanding a giant monster, protecting her family, and grappling with how her life changed in an instant. Comedy collides with genuine action as she discovers that being a reluctant beast warrior beats losing everything.