Started Building Power at the Age of Six

[With system] [Single female protagonist] [Demon clan] [Behind the scenes] [Building power] Watch the treasure appraisal live broadcast at home! There is no one to help me reach the top of the mountain! Accidentally time travel into the body of a six-year-old child! I don't know if it's God's will or arrangement! Let me lead the demons to one big world after another. Human race, demon race. They are all my stepping stones. What? Why am I so strong! Because I have a system!