Photon Earth is a young, gentle boy with superhuman strength who bears the word “Baka” (Japanese for “idiot”) scrawled on his forehead, a prank by his mischievous friend Aun Freya. One day he unexpectedly finds himself engaged to the beautiful fugitive pilot Keyne Acqua after he writes the same word on her forehead. Little does he know that this is only the beginning of his troubles: he must protect both Aun and Keyne from the villainous Papacharino, who seeks to hijack the secrets of “Aho” energy hidden aboard Keyne’s grandfather’s ship.