Luck is for fools

Our protagonist finds himself transported from his mundane life to a strange new world. He awakens in a forest, alone and confused,

He discovers that he possesses the gift of luck, which becomes his advantage in this world of monsters.

But sometimes even a good luck can be a curse, especially if that luck only works in combat. What to do if your luck is pushing you to become stronger?

What to expect: System, and all that entails. Nothing will be given to the protagonist except his luck, and it will be a slow crawl to power. Using as much as modern knowlege as the protagonist has. Failing a lot of times. Romance later in the novel.