The mammoth which should be buried in a glacier, appears at an amusement park where Jun and Jinpei have gone. While saving the children, Jun's shoe falls off and gets stuck between the mecha's claws. Jun reports the loss of her shoe. Nambu tells her to look for it. He says that, with Galactor's scientific power, they might be able to discover the secret of the transformation from the shoe. In the Galactor base, Katse orders the analysis of the shoe which remained completely intact after burning in the incinerator. At last they find out the frequency of the electrical waves which cause the shoe to transform into a white boot. X has Dr. Mizuno start developing a weapon to undo the transformation. Additionally, they start searching for G-3 based on the data gained from the shoe.16 year old girls are recruited for a beauty center. Jun, who is depressed because of losing her shoe, applies for the job, even though she knows that it's a trap. The female commander, who has captured the four other candidates besides Jun, puts them to sleep and transports them to the base. Jun pretends to be sleeping and transmits a bird scramble signal. Jun is led off to the base and questioned by Katse. When it's almost too late, the God Phoenix appears. Jun seizes the opportunity and saves the girls, recovers her shoe and gets into the God Phoenix. Katse fires the rockets of the mecha, but because of the guiding system built in by Ken, the rockets return and the base explodes together with the mecha.
