At the beginning of the 21st century, Tokyo suffered a catastrophic earthquake that left half of the city in ruins. This disaster served as a harbinger for the impending apocalypse. Isato Kaiza, a popular and athletic high school student, was unprepared for what came next. His peer Kash, also known as Hellstinger, presented Isato with a Caizer Stone. With this mysterious crystal, Isato gained the ability to transform into Gowcaizer, an armored superhero. In order to save the world from Omni Exist, the embodiment of all negative human desires and the entity behind recent disasters, Gowcaizer and Hellstinger must team up. If they fail, the human race will be destroyed.