After having his heart broken by his childhood friend who married the prince, Leon just wants to be left alone in his sorrow. However, his life turns upside down after a surprising visitor knocked on his door. It turns out his mother was a runaway Elven Saintess, and that he was actually a prince? Now Leon has to go back to Great Forest to save the World Tree from it's demise, stop the machinations of the Demons, and join the hero to save the world.