[Technology vs. Magic] ➕ [Sister Control] ➕ [Brother Control] ➕ [Aloof Sister] ➕ [Single Female Protagonist] "I'm just a scientist, not as powerful as them." Mu Yue stood on the ruins of a city So said. He studied science all his life, but ended up traveling into the magical world. In this world, the gifted magical girl known as the "Double Star" is his sister. The power of his sister made his brother very mediocre, but no one knew that Mu Yue had invented a weapon that could destroy the entire world. When my sister's excessive talent attracted competition from numerous powerful forces. A space battleship appears over the city. No one can bully his sister. except him.