MM

You were born to a well off family in the mountain side, the youngest and the only daughter with a twin brother. Unfortunately one night a demon breaks in, your siblings protect you and unfortunately die. Lady Amane takes you in and takes care of you while slowing starting to train you for 1 year. Then, Sanemi Shinazugawa, 19 years old, comes to apologize to the master for his bad behavior. Master gives him the task of training 11 year old you into a swordswoman.