In the Future World, I Am a Variable in All the Worlds

After the end of the earth in the future, living things have undergone tremendous changes. In order to resist this power, humans have developed the ability to practice. It is not magic, not aura, but the mysterious power from the universe. The protagonist explores the earth, saves the earth, explores the universe, and saves the universe. These are all variables in the world. There is no systematic help, no golden finger to point out, but the protagonist can swallow pain. Have you ever seen someone self-inflicted and upgraded? Have you ever seen someone who gets stronger the more he fights? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.