Un ancien démon qui a ravagé le Japon il y a 800 ans marche à nouveau sur Terre. Demeega va rencontrer un nouvel Ultraman qui ne sera pas tendre avec lui. 800 years ago, an iron clad demon rampaged on Japan until he was defeated and sealed away by a Giant of Light. Now, Demaaga comes out again, causing the river to boil, the volcano to erupt, and a new giant to come and destroy him.