Kindan Shitei de Breakthrough: Yuusha no Musuko ga Maou no Deshi de Nani ga Warui

“Compared to our time, the current generation just aren’t as reliable” they said, “Still, isn’t he the son of the Hero?”

How annoying. It’s 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, Earth, was a talented man, and everyone expected him to succeed his father as a warrior and defend his country, but Earth was always wary of his father’s title.

One day, Earth is shocked to find his father’s sword, which was used to overthrow the Demon King, sealed in his family’s mansion. Because trapped within was the ghost of the Great Demon King who was unable to pass on and continued to roam the world. ...