A saint who has been summoned to another world cries "My boyfriend is dead" and won't work for me. By the way, that dead boyfriend is me in my previous life.

Edward is reborn and lives a carefree life as the third prince of the small kingdom of Astraea. However, his life changes drastically with the appearance of a saint summoned by a goddess. Edward, not his brothers, is chosen to be the caretaker of the saint, whose mental state is reflected in the weather. When he asks her why she cries, she says, "My boyfriend died. --I said, "You don't cry for a reason like that. Because that dead boyfriend was me in a previous life!