After marrying the prince, Cinderella’s “happily ever after” ends when he falls for another woman and proposes to her. A small, powerless field mouse, who dearly loves Cinderella, wishes she could smile again. Mysteriously, the mouse dies and wakes up in the past, when Cinderella was still mistreated by her stepfamily. Then comes a twist: the mouse isn’t ordinary, but a noble beastman from the prestigious Field Mouse clan. With her true identity revealed, she decides to run away with Cinderella — before the prince and his glass slipper ever show up.