Transformation or Death - Chapter 121

Being poor, weak and introvert, Daniel Lolzwood has always struggled to get a friend, let alone a girlfriend. Who would have thought that one night, a succubus, the most beautiful girl he had ever seen, would come begging him to become her boyfriend? She even gives him a strange system. He can now visit a fantasy world and...Enough with words. I guess it's time to become both rich and handsome while enjoying beauties and revenge..............................Additional tags: [No Yuri] [No NTR] [Adult Content Warning]

This legend tells the tale of the protagonist, Kuroki summoned to protect the demon king from the hero.

Kuroki, unbeknownst to him, suddenly came to another world. He was summoned by the demon king, Modes. The territory which the demon king overrules was in the midst of being destroyed because of the hero. He had no choice but to bow before Kuroki.

“Please save us, Savior Dono!”

Kuroki nodded, deciding to save the demon king due to an unexpected turn of event.

I was a genius in the Earthen Plane.

All it takes is one monster for the world to go to ruins.Life as Nadine knows it goes to shit and she has to accustom herself to life underground, that is until an accident forces her out into the real world.Caine has no idea why he saved Nadine.She is everything he hates- rich, spoiled and entitled- and yet, he couldn't just let her die.Living outside is hard enough without having to save someone else and yet, he does it with Nadine.Thrust into a world that she has no idea how to navigate, Nadine is forced to rely on Caine.Her life is literally in his hands.They soon realize that maybe the monsters are the least of their worries.