《洄游之夜》讲述了一位少女在梦中邂逅了神秘、陌生却熟悉的小女孩和少年，和他们一起在自家客厅里展开的异空间经历了奇妙的冒险的故事，最终少女苏醒，却发现现实里的自己已经是垂暮老人，而梦中的伙伴们是她人生中最重要的伙伴们。Migratory Nights is the story of a girl who meets a mysterious, strange but familiar young girl and a boy in a dream and joins them in a fantastic adventure in an otherworldly dimension that unfolds in her living room. Eventually the girl awakes, finding that in reality she is a dying old woman and that the girl and the boy in her dream are the most important ones in her life.