Koi ni Koisuru Koushaku Reijou no Kojirase Renai

Katrina is a noblewoman who loves to read romance novels and immerse herself in fantasies. Though her engagement with the crown prince has been decided, she dreams of being able to love freely, as she has not forgotten her first childhood love. Then one day, Leonhardt, the crown prince, breaks off his engagement with her without any prior notice.