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In 1974, Morikazu is 94-years-old and his wife Hideko is 76-years-old. They live at a house in Ikebukuro, Tokyo. The garden at their home is full of trees, plants and insects. Morikazu paints pictures of the creatures in his garden..

In this story, our heroes will use full-force full-throttle (全力全開 Zenryoku Zenkai) to stop the enemies who are trying to destroy the parallel universes. One hero known as Zenkaiser, with a heart of justice, will stand up to a preposterous giant mass of evil who has managed to break into their home world. Fighting alongside him are four robotic lifeforms.