This is the third movie of the trilogy created by the "Super Peace Busters", an anime production team formed by anime director Nagai Tatsuyuki, story writer Okada Mari, and character designer Tanaka Masayoshi. The other two movies being "Anohana: The Flower We Saw That Day" (2011 TV series and 2013 theatrical version) and "The Anthem of the Heart" (2015).