A 16 year old Carol is going through a period of major changes in her life. On the one hand, Carol has to deal with her mother's marriage to her new boyfriend and the impending relationship with her future stepbrother. On the other hand, a new school year begins in high school, in which Carol starts her first real relationship and experiences various situations with her long-ti...。影片改编自直木奖作家伊集院静的同名小说,讲述的爱犬死去的八岁女孩沙耶香(新津世知饰演),和多年前失去幼小儿子的老人布濑(笈田吉饰演)在交流重要家人离开的心情时,逐渐温暖内心的丧失感的感人故事。在大城市过惯五光十色生活的嘟嘟和哈哈,放暑假的时候被父母托付给住在城市边缘生活的奶奶家。虽然奶奶很喜欢他们,但面对陌生、无聊的环境,他们产生了回家的念头。无意中闯入封存已久的地下室,遇见了猫公主小月,慌乱中嘟嘟、哈哈帮助小月顺利解决了困难,小月请他们吃冰淇淋感谢他们。第二天,嘟嘟和哈哈好不容易等到天亮,又偷偷走到地下室,看见梦想中的小月,他们欢喜雀跃地知道了昨天的一切都是真的。所有的故事也将由此展开……。