Ashi Girl (2017)

Hayakawa Yui is a 16-year-old girl whose only strong point is her ability to run fast. She accidentally goes back in time to the Warring States era where she makes use of her ability on the battlefield to protect her beloved young prince. Through finding a goal to work towards to, Yui finds a new world waiting for her as she uses her power to change the person she loves and move the people she meets.