[One-Shot] After being burned by the reincarnated hero and having my childhood friend taken from me as a saint, I want to seek revenge under the Demon King.

This is a simplified version of the popular "hero NTR" genre work. To be honest, it's just a template. You could also call it just a plot. Unlike many similar works... its only selling point is that it doesn't go unfinished. This is the 1st work in the "Ranking Naro Templates" series (I wrote this feeling that popular unfinished works don't need detailed descriptions).