The Gaurdian and Protector of the Universe

A demon who always stuck with his cruel brother to force him to kill people in human world of thousands of years, until one day after the war of humans and demons, only one demon standing at top of the hill of human corpses, a god give him a chance to live a normal life by helping people from another worlds in different universes and dimensions but on one condition. He needs to find a suitable human to help him and teach him about human lives and stuff. Did the girl he chose from Earth with field with science, will accept his offer to become his partner? or she will refuse his offer to her? This is the story about adventures to every universes and one day a demon to become a demon king to his own world and stop his brother!

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Hi this is the author!

I'm so fluent with my english, i hope everyone understand, ill try my best to fixed my grammar too! 🤗