Meet Photon Earth, a kind-hearted young boy with extraordinary strength and a forehead marked with the word 'Baka' (translated as 'idiot' in Japanese) courtesy of his mischievous friend Aun Freya. Unexpectedly, he becomes betrothed to the captivating fugitive pilot Keyne Acqua after a playful forehead scribbling incident. But the real challenge arises when he must shield Aun and Keyne from the nefarious Papacharino, who aims to pilfer the secrets of 'Aho' (another term for idiot) energy stored in Keyne's grandfather's vessel.