I'm ordinary, but my sister is the strongest elf

Introduction: [Technology vs. Magic]? [Sister Control]? [Brother Control]? [Sister Gao Leng]? [Single Heroine] "I'm just a scientist, not as powerful as them." Mu Yue said standing on the ruins of a city.He studied science all his life, but ended up traveling to the magical world.In this world, the genius magical girl known as "Double Star" is his younger sister.The strength of his younger sister makes his elder brother very mediocre, but no one knows that Mu Yue has already invented a weapon that can destroy the entire world.When the younger sister's excessive talent attracted countless big forces to compete for it.A space battleship appeared above the city.No one can bully his sister.except him.