Brother Is a Magical Girl, Sister Is a Violent Monster

When you are at your most lonely and hopeless, a door will open beside you. Traveling into this world where disaster beasts and monsters are rampant, Lin Lu waited for eighteen years. At the moment when he was at his weakest, the door opened - he could transform into a magical girl! From then on, Lin Lu opened his "trumpet" - the magical girl Lin Ying, who transformed into a disaster beast and a monster killing machine: "You are a weirdo one day, you will be a weirdo your whole life, kill!" "You're just a scourge, I'm too lazy to reason with you, you don't deserve to listen, kill me!" Lin Lu killed monsters and leveled up all the way, until... He discovered that the three sisters were all world-destroying violent behemoths! Brother Haji, can you not defeat the violent behemoth sister even if you try your best? ! … The eldest sister, Lin Weiyi (tsundere): "My brother is actually a magical girl?! A bastard like him will definitely be tortured and killed by monsters. I will show mercy and help him." The second sister, Lin Yayi (sinister): "It would be super fun to create a villain alliance and fight against my brother!" The third sister, Lin Mengyi (cute): "Weiyi, Yayi, I lost my brother's transformer, what should I do? Urgent, waiting online..." Hajimei, you, even if you try your best, you can still control your magical girl brother? !