It's Yuna's 18th birthday! But there's no time to celebrate, as the Petrification Evil Monster Gargorgon is resurrected from the depths of antiquity. As the monster closes in, a mysterious yellow fighter jet appears. And at long last, President Shizuma's past, and the hidden secret behind Yuna's birth are finally revealed!

The discovery of a stone tablet reveals new long hidden information. But meanwhile, the evil clutches of Darrgon close in around Yuna! Kengo and Akito rush in to save the day, but Darrgon is not quite his usual self... You can't be serious! Darrgon has fallen in love with Yuna!?