Ep. 1: Amnesiac Daisuke meets Koji Kabuto in the desert as Grendizer appears

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A man with no memory is rescued from the desert by Koji Kabuto and given the name Daisuke. The two quickly form a bond during their time together. However, their peaceful interaction is interrupted when unidentified forces launch an attack on Earth. In response to this threat, a giant robot known as Grendizer makes its appearance. This event marks the beginning of a new chapter involving the amnesiac stranger and the established hero, setting the stage for future conflicts against the unknown aggressors targeting the planet.