Nanatsukawa Hozumi

Karen is about to get married and is enjoying a happy time with her family when, without warning, her fiancé Chris and his father suddenly call off their engagement. She is upset by this unexpected event, but when she asks Chris why, he says that he wants her to switch places with Mary, who is also Karen's best friend. Karen's honor and dignity are damaged by this outrageous act, and she falls into a state of despair. This is a scintillating fantasy about a dowdy, graceful, and elegant young lady! https://www.cmoa.jp/title/273460/

Celeste, assigned by the organization, becomes the bodyguard of Prince Edward, the heir to the Midland Kingdom. As they spend time together, she witnesses Edward's strength and vulnerability, and gradually decides to protect him of her own will. Edward, in turn, trains his body and mind, determined to be strong enough to protect Celeste. 'I love only you.' As they overcome numerous challenges, the two grow closer. However, the barrier of their difference in status—he, the prince, and she, just a bodyguard—becomes an obstacle they must face...