The books also inspired a Miyanishi Tatsuya Gekijō: Omae Umasou da na, series of television anime shorts in 2010.
The film will open in Japan early this summer.
Oscar-winning composer Ryuichi Sakamoto (The Last Emperor, The Revenant) scored the music, his first for an anime film since Wings of Honneamise 33 years ago.
The second film, Anata o Zutto Aishiteru, opened in Japan on June 6, 2015.