Denkou Choujin Gridman: boys invent great hero

Denkou Choujin Gridman: boys invent great hero is a anime short produced by Tsuburaya Productions.

Plot
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"