Time Travel Ninja Princess

She is a ninja killer of an international ninja organization in modern times. He is sinister and cunning. He has been planning for more than ten years and hiding his strength just so that he can escape from the control of the organization and walk freely in this world. She jumped off a cliff just to escape, but unexpectedly she traveled through time and became the granddaughter of the general protecting the country of the Eastern Holy Kingdom in the blink of an eye. Just wear it, she thought it was a bargain, she thought she could easily be proud of the world from now on, but who knew... I am one-on-one, the heroine has a dark side and the hero is strong, and the supporting characters are all extraordinary~