Kyouta Shinzo. The strongest swordswoman who's been wandering around Japan and kill specific people and other specific people, assassins and criminals using her katana. She never joined a group. She had the worst past and her parents died when she was at a very young age. One day, an "old man" decided to takw care of this little girl. He lives alone, no family to see. An "old man" who was an assassin before.
He thought Kyouta a lot of fighting skills, how to defend herself from harm, sharp thinking and how to use a katana (sword). He thought Kyouta a lot and treat her like his own daughter.
One day, a famous billionaire saw the old man with Kyouta. The billionare decided to kidnap and kill Kyouta but was protected by the old man. Why would he kidnap Kyouta? Because she's a daughter of a certain someone. After the old man's death, Kyouta decided to run away from the billionaire and grew stronger all by herself.
While she was wandering around Kyoto with her hood on, a boy, same age as her, noticed her then called out her name out loud. She quickly grabbed the boy somewhere they can hide. Will they get caught? Will she kill the boy?