Hitokiri" Shoujo, Koushaku Reijou no Goei ni Naru

Shurine is a skilled swordswoman trained from a young age to serve as a bodyguard. However, her life takes a drastic turn when she is falsely accused of attempting an assassination, forcing her to flee and live on the run. During her exile, she encounters Lutecia, the daughter of a duke whose life is threatened by a bitter succession dispute. When Lutecia falls victim to an assassin’s attack, Shurine steps in and makes her a proposal.