Summary
Compared to our time the current generation just arent as reliable they said Still isnt he the son of the Hero How annoying
Its been over ten years since the battle between mankind and the demons ended The children of the heroes who saved the world are all grown up
One of them Eirth was a talented man and everyone expected him to succeed his father as a warrior and defend his country but Eirth was always wary of his fathers title
One day Eirth is shocked to find his fathers sword which was used to overthrow the Demon King sealed in his familys mansion
Because trapped within was the ghost of the Great Demon King who was unable to pass on and continued to roam the world
For some reason only he could see the spirit of the Demon King and the Demon King possessed him through the sword
Every day forced to coexist with the spirit of the Demon King they live a strange shared life when the Demon King whispers to Earth on a whim
I have a grudge against your father If you want to get back at your father and the world Ill train you Im free
Eirth receives special personal guidance from the Demon King just to get back at his parents and the world
Then in the coming days The hero parents the heroes of the past the first love the princess childhood friend the geniuses of the era and the world will tremble