Limitless Blue: Spellbound By Contracts

Brother, leave me and run. Live your life.
"Vermins!" He growled atop the fallen assassins.
Emil was born with a weak body and barely could walk, and the weakest of wind sends her tumbling to the ground. But, inside that weak body of hers laid a limitless fountain of pure mana, swirling in a blue flood of raw magic.
She was hunted since birth by people seeking the power hidden inside her. But, all of them failed due to one man. It was her twin brother, Alexander.
Alexander was born without a single drop of magic. But, his body was the pinnacle of human might and power. He used that power to slay every mage that came for his sister, sleeping guard with one eye open.
Follow the story of Emil and Alexander as they survive in the world. She tries to show her brother a life where she isn't a burden on his back, while he tries to show her a world where she isn't hunted each day.