My sister became a devil in another world and gave me a cute girl

Story of: My sister became a devil in another world and gave me a cute girlLu Tu traveled to a parallel world where games and reality merged, and everyone worked full-time.Everyone despises changing jobs and is called a cursed profession: Summoner.But Lu Tu didn't panic at all, because his elder sister also traveled through time and became a demon king in a different world.At the beginning, a super full-time mage is sent, with invincible damage output and defense, and a cute white-haired girl.Sister: Brother, are you still missing someone?There is a shortage of everything here, except for professionals.Unknowingly, with the dual assistance of the system and his sister, Lu Tu found that he was invincible.Lu Tu: Sister, what is it like to be a demon king in a different world?I want to try it too.