Due to Global Warming it caused a polar ice cap that harbored many creatures in it to break loose and wreak havoc, only one would put them all into line, Raiga the god of monsters, he hadn’t been seen in over 10 years since his battle with the fire beast Ohga, but he would return nonetheless to Asakusa thanks to the threat of a new kaiju with Raiga returning as japans ally instead of its foe