The Demon Prince goes to the Academy

The Demon Prince goes to the Academyat I died while I was reading hate comments on my novel.I was already in shock over my death, but some Grim Reaper’ appeared and told me that being a bad writer was a sin. To atone and make it into heaven, I was told I needed to survive past the ending in one of my novels.And so, I entered the novel The Demon King is Dead'”Da** it all!! Why did this have to happen to me?!”By all misfortune, the character I possesed was the Demon Prince, a character with no combat abilitieswho dies at the very start of the story!!