Davy Al Rune was the first prince of a very ordinary kingdom. His happy and peaceful childhood was shattered as the reality of his position hit. With the assassination attempt on his life, he falls into a coma where his consciousness and soul travels to the Paradise of Heroes, a place where heroes of old are gathered. He goes through vigorous (hell-like) training through the help of these heroes and returns back to his body. Upon waking up, he vows to get revenge on those you made his life a misery with the help of the powers that he gained through his training by the heroes he had been taught by.

The weak prince of an insignificant country, Davey.
After becoming comatose, his soul escaped to a temple where the souls of heroes gathered.
He trained for a thousand years and has now returned as a max level hero!
“Just you guys wait, I’m going to face you all head on!”
The refreshing story of Davey’s royal life and revenge has just begun.
(This manga and its chapters uploaded from mangatx)