Haru Yoshioka is a quiet and shy high school student who has a suppressed ability to talk with cats. One day, she saves a cat from being hit by a truck on a busy road. The cat she saved turns out to be Lune, Prince of the Cat Kingdom. As a thanks, the cats give Haru gifts of catnip and mice, and she is offered the Prince's hand in marriage. Her mixed reply is taken as a yes.