The colossal kaiju, Reugosite, is on his way towards Earth in attempts to destroy it all! The Minato brothers and their mother, Mio Minato, have managed to develop a way to contain Reugosite within a Crystal! Their strategy is successful, but as Mio prepares to send the Crystal into the other dimension, Saki Mitsurugi, who is after the complete annihilation of Reugosite, interferes! The two Ultra Brothers then declare that they will save both the Earth and Saki! Saki then transforms into a super armoured kaiju known as Grigio Regina, in order to fulfil her mission…