Creating A New Legend Through Practical Magic in the Harry Potter World

It wasn't easy for Tachibana Ayami to become one of the top Assassins in the whole of Gretzheims. Unfortunately for her, just before she managed to finish her last mission, she was betrayed by her younger sister, the person she trusted the most.She died, filled with regret. Yet, the next moment she opened her eyes, she realized, she had actually been reincarnated in a world of magic and wizardry...