"I am not suited for you; I am ending our engagement." Cornelia, the daughter of a duke, is abruptly informed by the First Prince, Leonhardt, that their engagement is annulled—in the middle of a grand ball. The next morning arrives—or so she thought—but Cornelia finds herself inexplicably back in the morning of the previous day. Once again, she braces herself for the ball and the engagement annulment. Yet, this time, Leonhardt’s demeanor is different from what she remembers. Despite their strained relationship, the two decide to work together to escape the endlessly repeating "today"—but can they break free?