Extra's Re-awakening: System Errors Made Me Too OP - Chapter 1: Rai Voltia

Lin Fan acquired the Sign-in System that led him on the path of the life of a god-level nouveau riche.

I’m Kuna, a former countess’s daughter, working at the café of the Adventurers’ Guild “Shield of the Silver Wolf.” Together with my Carbuncle, Lulu, I spend my days serving customers with special drinks infused with healing power!One day, a customer from my own White Wolf tribe visits…With the newly joined companions, I find myself facing my family, who is trying to take me back to the Kingdom of Aluda!The happiness everyone in the guild has given me—I will protect it this time!This is a life-reversal story filled with fluffiness and healing power!

Her revenge required his resources. His price was her surrender.She ran from a gilded cage. He’s the only man who can give her the keys to her revenge—and the one who knows how to make her beg for his touch.Her only weapon is a job at Daki Tech, where she finds herself at the mercy of her childhood rival, the ruthless billionaire Reomen Daki.He offers her a deal: his resources for her vengeance, in exchange for her absolute submission in a brutal professional war that bleeds into nights of white-hot tension.Their every clash is a battle of wills laced with searing attraction, a dangerous game where the lines between hatred and hunger blur.To burn her family's world to the ground, she must first play with the one man who knows how to make her burn.

Our protagonist Caam is a man from Earth that was reincarnated into this world as a demon. In order to survive, he spared no effort in avoiding the sparks of battle and without noticing it, he became strong himself.