Henpukumaru  

Although being highly skilled as a Ninja from the "Tekki" (Iron Demons) school, she couldn't complete her mission because of her unwillingness to kill a young boy. She then ran away from her superiors and woke up in the mansion of a wealthy landlord. Determined not to harm anyone again, she tried to start anew. However, when the mansion was attacked and all guards were killed quickly, she had no choice but to defend herself.