Universal Contract Mage

A contract is not just a master-servant contract with a familiar or a demon. Or is it a contract signed with different people, a regular contract formed. Red became a mage because of the contract, and he will also use the contract to transform the world. Now that the mage has returned from the demon world, will he use his power to benefit mankind, or will he accept the fate of reincarnation? "I want to open a shop here." The mage just replied.