Manga recommendation where girl "saves" guy for selfish or narcissistic reasons?

I'm not familiar with Welcome to NHK but I have something that might fit the premise.

Villains Are Destined to Die is a manhwa about a woman being transported into a video game as a villainess who, as the title suggests, is destined to die. Because she's familiar with the game and REALLY doesn't want to die she does whatever she can to manipulate the male leads of the game to avoid that outcome. That includes helping a slave whose sole purpose for her is to become her loyal servant/guard.

Anything in the Yandere department.