Masaru Asou was the lab assistant of geneticist Doctor Mochizuki, and was used as one of his experiments, enabling him to transform into grasshopper-like being called Kamen Rider ZO. He fled into the woods and went into a coma before Dr. Mochizuki sent him a telepathic call for help; he had created the Neo Organism, too powerful for him to control which he considered his true first creation, as Dr. Mochizuki told the infantile Doras that he had to use a human base creature, Masaru, to create the kamen rider ZO. Masaru must protect Mochizuki's child, Hiroshi, from the creatures made by the Neo Organism.

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