Her Blue Sky (空の青さを知る人よ, Sora no Aosa o Shiru Hito yo) is a Japanese animated film produced by CloverWorks. The film is directed by Tatsuyuki Nagai, written by Mari Okada, and characters designed by Masayoshi Tanaka designing the characters and serving as chief animation director. The trio under the creative team Super Peace Busters previously worked together on Anohana: The Flower We Saw That Day and The Anthem of the Heart. It was released in Japan on October 11, 2019 in all Toho Cinemas.
Set in the same Chichibu city as Anohana, the story follows the Aioi sisters, Akane and Aoi, who have lived together since their parents' passing 13 years ago. One day, older sister Akane's ex-boyfriend Shinnosuke Kanemuro, visits the city to perform at a festival. At the same time, 18-year-old Shinnosuke, called Shinno, also time-travels from 13 years ago. While Aoi starts falling love with the 18-year-old Shinno, Akane and the 31-year-old Shinnosuke finally reunite...