When the kingdom of the Light Elves lost the war against the Dark elves, the princess of light Yaqota took the power source of her race, the Diamond, and fled to the human world in order to keep it safe. However, after a few years has passed the dark elves tracked her down, kidnapped her along with her son Augai, destroying the human town that housed them in process. Years have passed when Augai suddenly appeared before his friends in the human world, determined on saving his mother, together with his friends Crown, Maya, and mikuro, they ventured into the unknown, into the land of the elves.