Reincarnated into an Otome Game as the Heroine's Sister

In her past life before reincarnating, she was a test subject where they fused an ancient, enchanted demon katana with her soul and became the World's top assassin and War machine. Now given a new start, she is determined to live a life with no regrets. ~Details~ Updates randomly in clusters?? (Meaning, when updated it's at one time with multiple chapters) Still ongoing Hope you guys enjoy!! Any criticism, feedback or advice welcomed and appreciated!