Etsuko, a man in his late 20s has always had a very creative mindset when it came to be a hero like a Kamen Rider but never had the skill to be one until one fateful day. Now he fights for the dreams of the people known as Kamen Rider Genkaku!

An archaeologist named Riku Hitsu, accidentally unleashes a violent species called Metoryu, sentient beings using the power of prehistoric creatures and common earth elements, during an archaeological dig. Using the power of the Kaseki driver and Dimagos, egg like devices. Hitsu becomes Kamen Rider Kaseki to combat these foes and to prevent humanity's extinction.