Seirei no Moribito

Synopsis

Balsa gets challenged to a duel via letter by a former rival named Karbo, but she declines when she meets with him. Karbo hires a stone shooter named Gyopsal to target a traveling couple, named Tandor and Sena, in order to draw out her anger. Attempting to protect the couple during a downpour, she stays at an abandoned hut with them for the time being. Balsa is unable to get any sleep because Gyopsal was ordered to shoot stones at her all night until sunrise. When the couple prepares to leave, Balsa explains her situation to them. When Karbo reveals himself, Balsa engages in a fierce duel against him with overwhelming anger. She slashes him but assumes that she may have killed him, having broken her vow never to take another life.

(Source: Wikipedia)