In a different world, demons and humans coexist in this era; humans need to practice, and if you have no mana at all, you will be ostracized by others. People in this era can live for hundreds of years, and the higher the mana they cultivate, the longer they live; demons also need to practice, and ordinary demons can transform into half-demon, but cannot fully transform into humans. The higher the magic power of a demon, the more powerful it can be completely transformed into a human form...