After a thousand years of war, the Mishnese and Karupta have made peace by wedding the Mishnese princess royal to the Karupta crown prince. Their son whose birth was foretold 10 centuries ago is destined to rule the entire planet and end the wars forever. But the princess and the baby have died during childbirth or so it was said. In the meantime, a strange half-breed infant boy is left at an orphanage with a purse full of gold coins.

The Boy who Lit up the Sky follows the early years of Senya from the streets of Old Mishnah, to the Palace of Mishnah and from there to Karuptani where he is taught to live off the land and fight for that which is his. Along the way, he finds the human girl who, unbeknownst to her, shares his important destiny.