Upside-down rainbows are being sighted throughout Japan. They are said to herald the onset of rain. Gento suspects that a kaiju may be behind this and decides to visit Professor Yokomine, a leading kaijuologist and also his mentor from school. Yokomine tells him about Nijikagachi, a god-like being that can at times bless the land with rain and at times summon utter destruction. That's when Gento receives news about an appearance of a giant kaiju!

The typhoons that Nijikagachi created are about to wash away civilization. Gento decides to deploy Earth Garon's new Mod.2 unit into battle to defeat Nijikagachi. Teruaki, who had a deep respect for Yokomine, goes to persuade the mastermind of the plot.

Tetsuo is a humble businessman working for the Japan Kaiju Damage Insurance Company. He doesn't have big goals and just drifts through life. However, he starts realizing the meaning of life through his interactions with Michiko, a homeowner he pitches a sales to. Meanwhile, Red King and Guigass appear, tearing through the mountains of the Alps. Tetsuo runs back for Michiko, who lives in the town where the kaiju are rampaging...

SKaRD is forced to deal with the appearance of kaiju around the world. Gento transforms into Blazar to fight them off as well, but the battles are taking a severe toll on his body. Earth Garon is dispatched to deal with Taganular's emergence in Koarai. However, at the same time, Taganular also appears in Nevada, US. Blazar is left with no choice, but to head down to fight it. However, that's when he discovers Taganular's surprising ecology.