Shin Mazinger Zero

The inventions of world renowned scientist Juzo Kabuto are peerless. But Professor Kabuto lives with a heavy heart after his research cost the lives of his grandchildren's parents.
One ominous day, Juzo Kabuto gives his eldest grandson Kouji a terrifying inheritence - a giant robot known as Mazinger Z, a machine that is the pinnacle of Juzo's legacy. This super weapon is capable of making Kouji Kabuto the most powerful person in history, with the destiny of the world in his hands. Mazinger Z has the potential to become the savior of humanity… or the calamity that ends it. With Mazinger Z, Kouji Kabuto can become God or Devil.
But when Kouji begins having visions of lives he's never lived, will he be able to keep his grasp on reality long enough to survive what awaits?