Sign a Soul Contract with the Devil at the Beginning

There are many unknown things in this alien continent. Here, beast master is the only profession. But there are not only spiritual beasts here, but also unknown creatures - demons. Their whereabouts are unpredictable, they have inhuman power, they are extremely powerful, and they are the existence that dominates everything. However, due to some reasons, demons have become like spiritual beasts and need to sign a contract to obtain the right to move. But throughout the ages, countless people have longed for that kind of power, and many people have pursued it, but they have never heard of success. Our protagonist, in a crisis, encountered a demon. As his heart gradually darkened, he made a deal with the demon - exchanging soul contracts! (Brothers, please count the votes!!!)