Mirai no mirai

The birth of a sibling is a joyous time for many, but not for Kun. Four years old and spoilt rotten, he sees the arrival of baby sister Mirai as competition for his parents' love. That is, until magical encounters with an older Mirai and family past, present and future send the siblings on an intimate journey through time and space, to confront Kun's uncertain feelings and prepare him to become the big brother he needs to be. (Anime Ltd)