In a cruel world with a system.

Our hero was reincarnated in a cruel and cold world. In a world where the weakest monster is able to kill you without wasting energy. All that will help him is a system that will help him survive.(There will be no harem in this work. The main character will not be dumb as a log. And the system will be very simple and without any 3-meter statuses. Good luck with your reading. Also, I won't throw out this fan fiction, and you can add it to the library, and I'll release chapters from time to time.)