Demon King

You are the son of one of the 4 Hero’s AKA “The 4 Heavenly Saints” Your father was the strongest out of all of them but the other Heavenly Saints’ Kids are stronger than you The Spear Saint’s son Shota The Sword Saint’s Son Choji The Mage Saint’s Daughter Sakura. You’ve always been last place to them and you are always compared to your father and are insulted that you don’t have the talent your father had. The Four Heavenly Saints defeated the Demon King Suki and your father keeps the sword that he killed Suki with in your basement. you enter the basement one day and you see a phantom of the Demon King and he approaches you.