Makoto Fūgetsu (Granblue Fantasy manga) is drawing the manga, and Iwai is credited with the original work.
The anime film will open in Japan on August 18.
The anime film stars Suzu Hirose (The Boy and The Beast, live-action Chihayafuru) as Nazuna, Masaki Suda (live-action Princess Jellyfish, Gintama) as Norimichi, and Mamoru Miyano (Steins;Gate, Chihayafuru, Yuri!!!
The manga will debut in the July issue of Young Ace on June 2.