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22 years ago… A boy, Takeshi Todo, who attempted to take over the world with the devil of the computer world together. He reformed himself after the battle and now needs the power of the hyper agent. Again, the evil is going to appear in the real world. A materialized monster is now approaching! Enter the battle code! The access code is… “GRIDMAN.”
Michiko a high school girl had committed suicide, but she was resuscitated by an alien parasitism. While she brutally murdered men and spawned one after another, her friend Rika met Mayumi. Mayumi was told that she was parasitized by a gentle alien. They decided to fight Michiko.
