At the behest of the organization, Celeste becomes the bodyguard of Edward, the crown prince of Midland. While spending time together, she comes into contact with Edward's strength and vulnerability, and decides to protect him of her own volition. Edward also trains his mind and body so that he can protect Celeste. ``I love only you.'' Two people who overcome many difficulties and are attracted to each other. However, the difference in social status between the Crown Prince and his personal guard stands in the way... A story of growth, battle, and love between two people who shoulder heavy roles and pasts.
組織の命を受け、ミッドランド王国王太子・エドワードの護衛となったセレスト。
同じ時を過ごす中で、エドワードの強さと脆さに触れ、自らの意志で彼を守ることを決めていく。
エドワードもまた、セレストを守れるようにと、心身を鍛えるように。
「僕はお前だけを愛してる」数々の困難を乗り越え、惹かれ合っていく2人――。
しかし王太子と一介の護衛という身分差の壁が立ち塞がり……。
重い役目と過去を背負う2人の、成長と戦いと、愛の物語。