Following the defeat of the Dinosaur Empire and the tragic loss of Musashi Tomoe, the creator of Getter Robo, Dr. Saotome, foresees a looming threat that could shatter the hard-earned peace. His apprehensions materialize with the emergence of the formidable Hyakki Empire. To combat this new enemy, Dr. Saotome unveils the enhanced Getter Robo G and establishes a cutting-edge Getter Robo base. With the absence of Musashi Tomoe, a skilled baseball player named Benkei Kuruma steps in as the third pilot, ready to join the fight against the Hyakki Empire.