The saint, on her 20th life, knows: soon, the world will be destroyed by the Demon King... However, in this bleak present life, a super cute girl named Maria is suddenly born! As people who have lived through countless loops (the saint, a duke's daughter, a prince, Maria's brother) wish, "I want to avoid the bad end for this child's sake," the future begins to change thanks to the little girl!? Moreover, her new friend is a boy who is the future Demon King (scheduled)—could this girl be the one to save the world? A refreshing romantic comedy where mob characters who have looped endlessly dote on a first-life young lady!