A small knight, in the time of fantasy is confronted with the quest to save the princess. Generically told, the hero quests for days in search for the princess who was captured by a dark knight.
During this quest he makes many allies that help him in his journey. They fight many battles and their power becomes more stronger each match they win.
Encountering many beasts and many foes they fight back with swords and magic. The show is lighthearted and childish as they save villages ans kingdoms.
Eventually, they encounter the dark knight that is empowered by 3 wishes he chooses, already having two.
They defeat him and rescue the princess, easy.
Yet the enemy wont give up so easily, thence, his third wish is to raise an army from hell.
This results in the princess getting killed, the hero is enraged.
Raging a final war, all his allies die in the end. The hero fights the antagonist one last time.
He defeats and slays him, the pain in his heart had persuaded him to take the 3 wishes, to back when life was perfect.
He did not know that wishes will affect him severely. Going back had forced him to not remember who he was.
What he did know was his friends, but there was one who had taken them. His last wish was to gain power, distorting his appearance into, the Dark Knight.