Gamu Takayama is a 20 year old member of an organization called Alchemy Star. After a monster known as C.O.V attacked the Earth, Gamu falls through a portal of light and meets the giant: Ultraman Gaia, who gives him his powers.
A mysterious typhoon seems to be caused by something other than the weather, and it's up to XIG to prevent the unnatural disaster from wreaking too much havoc.
Fujimiya awakens a monster, Zonnel, with the intention of stopping an asteroid headed towards the Earth. While Fujimiya might want to preserve the planet, Gamu fears that he's not as concerned about saving human lives.
Hiroya steals data on monster locations throughout the world and then uses Agul's power to rouse them, leading to a desperate battle between Gaia and Zonnel.
Hiroya's frustrations with humanity reach an apex as he enacts a plan to end what he sees as their futile hopes by destroying the Aerial Base. Gamu is the only one who can stop him.
