Mirai no mirai - 未来 の ミ ラ イ
Kun is a little boy with a happy childhood until the arrival of Miraï, his little sister. Jealous of this baby who monopolizes the attention of his parents, he gradually turns in on himself.
At the bottom of his garden, where he often takes refuge, is a genealogical tree. Suddenly, Kun is propelled into a fantasy world where past and future will mingle. He will meet his loved ones in turn at various stages of their lives: his mother as a granddaughter, his great-grandfather in his hectic youth and his teenage little sister!
Through these adventures, Kun will discover his own story.