Diana Lesley, a renowned knight of the Agripana Kingdom, is killed by her rival Cornelius Heimann in the war against the Heverunia Empire. However, when she wakes up, she finds herself at 10 years old and decides to pursue the life of a proper lady instead of a knight—much to her family's disapproval. After becoming Princess Juliana's lady-in-waiting, she must contend with conniving noblewomen, the threat of oncoming war, and the affections of Cornelius who, in this life, dreams about her past life and falls for her. Can she keep her loved ones safe and live in peace?