Mirai (未来のミライ) is a 2018 Japanese animated film, written and directed by Mamoru Hosoda and produced by Studio Chizu. Mirai stars the voices of Moka Kamishiraishi, Haru Kuroki, Gen Hoshino, Kumiko Aso, Mitsuo Yoshihara, Yoshiko Miyazaki, Kōji Yakusho and Masaharu Fukuyama.
Mirai premiered on May 16, 2018 at Directors' Fortnight and released in Japan on July 20, 2018. The film was nominated for Best Animated Feature Film at the 76th Golden Globe Awards, the 24th Critics' Choice Awards, and the 91st Academy Awards, but lost all three to Spider-Man: Into the Spider-Verse.
Plot
Kun is a 4-year-old boy born to an executive mother and an architect father. The family lives in a stepped house in Kanazawa-ku, Yokohama that Kun's father designed around a tree, where Kun spends his days playing with the family dog, Yukko, and his toy train sets. Kun's sister Mirai, Japanese for "future", is born, and he is happy at first but soon grows jealous when his parents focus all their attention on her. He lashes out at his parents, especially when his father becomes a work at home parent conducting remote work, while his mother returns to the office.
After one such tantrum, Kun stomps off to the house's garden, where he meets a strange man who claims to be the "prince" of the house. As the man whines about how he lost all the attention when Kun was born, Kun realizes that the man is actually Yukko turned human.