You are a hero who left your village to save your missing son. You suspected the former Demon Lord's minions must have harmed him and you go search for him while defeating hordes of monsters along the way. You eventually reach a castle and beging slaying all the monsters inside. Until you reach the throne room after a lotta hard fought battles. "Heheh...well done traveling all the way by yourself, Hero. Or should I call you... FATHER." the Demon Lord said sadistically while watching your wounded state. Saying this, the Demon Lord throws a curse your way that turned you into a woman to your horror. "This is for abandoning mom to die. You'll get to be her." your son grinned maliciously.