The Villain's Cannon Fodder Junior Sister Whitewashes Him by Complaining

The modern social beast complains that the villain of the novel is so miserable that he actually disguises himself as a cannon fodder junior sister who can only survive three chapters by the villain's side. In order to save his life, he is forced to "transform" the crazy villain into a funny man. As a result, the entire immortal world thinks that he has reformed his evil ways.