片尾曲《请笃信一个梦》由歌手周深献唱，这是其继《大鱼海棠》、《大护法》、《千与千寻》等影片后，与光线彩条屋出品动画电影的第六次合作

Cynthia and Mary show up to collect Cynthias inheritance from her deceased grandfather, the only item shes received is an antique sword that was believed by her grandfather to be proof that the South won the Civil War.