Grandiene has been waiting for the day of resurrection, the day when the planets are in the alignment of the Grand Cross. Her children descend to the Earth to make it a realm of darkness for her. Ten years prior, Doctor Tatsumi of the Tatsumi Disaster Prevention Institute predicted this event, but nobody believed him. He left his family so he could secretly develop and construct the Rescue System. Now in 1999, Doctor Tatsumi appears again to give the means to save the world to his children as the GoGoFive team.

Toron, a young tyrannosaurus boy, is carried off downstream and loses his memory. While making his way back home, he discovers new friends and finds out that working together is the only way forward in life.

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Rei, a high school girl, once lived in hiding with her father, who was involved in illegal gun trafficking. However, her father was murdered by two men: one with a red gun and another with a cross tattoo. As she grew older, Rei started dealing in guns, guided by Lin, who taught her about firearms. One day, Lin informs Rei that he has found the man with the cross tattoo, leading her to pursue her father's killer for revenge.