It's been 15 years since the outbreak of Ultra Flares on the sun that cause the Spark Dolls around Earth to turn into monsters. Officer Oozora Daichi, a member of the defense unit created to deal with these creatures, is confronted with a rampaging Demaaga, who can scorch anything with it's intense flame. Daichi then hears a mysterious voice from his multi-device. Guided by it, he unites with a giant of light in order to battle Demaaga. It's the birth of Ultraman X!
