The film takes the form of a mockumentary that follows Masaru Daisato. Daisato is an otherwise normal Japanese citizen except for an inherited ability to grow to a height of approximately 30 meters in response to the application of high voltage electricity. As both his father and grandfather before him, Daisato has accepted the duty to protect Japan against various giant monsters while working for a sub-division of the defence ministry called the Ministry of Monster Prevention. The Battles with the monster are televised, and the ratings appear to drop or pick up depending on the event, most of the monsters have obscure abilities, and he generally defeats them. Despite his great powers, he increasingly finds himself mocked by his fellow citizens while struggling under the burden of living up to a heroic lineage that increasingly overshadows his own mediocre accomplishments as a monster fighter. To further complicate matters, he is deeply estranged from his own wife and child. Eventually, he encounters a particularly formidable monster, said not to be from Japan. He runs away from it, which just results in more ridicule. Eventually, he receives assistance from some other monster fighters to challenge it.