The official website for the anime movie adaptation of Kaori Mado and Akamoku's Kimi to Hanabi to Yakusoku to (You, Fireworks, and Our Promise) light novel revealed additional cast, staff, the theme song, a key visual (pictured), and the first trailer on Tuesday. The movie is scheduled to premiere in Japanese theatres on July 17.

Voice actresses Rie Takahashi (Kanojo, Okarishimasu) and Natsuko Yokosawa (Bokura no Yoake) are joining the cast as Haru and Yukari Natsume, respectively.

Staff
Art Director: Toshiharu Mizutani (Banana Fish)
Color Design: Shiho Kuriki (Anne Shirley)
Director of Photography: Shinji Saitou (City Hunter Movie: Tenshi no Namida)
Sound Director: Takeshi Takadera ([Oshi no Ko])
Music: Alisa Okehazama (Kusuriya no Hitorigoto)

J-group timelesz (Hananoi-kun to Koi no Yamai opening theme) will perform the theme song "Kienai Hanabi," previewed in first main trailer below.

Akira Suzuki (Kami no Tou: Ouji no Kikan) is directing the movie at SynergySP and The Answer Studio . Kouhei Mori is penning the script. Yuuji Watanabe (Fairy Tail Movie 2: Dragon Cry animation director) is designing the characters.

Mado published the romantic light novel under Shogakukan's Gagaga bunko imprint in December 2025, featuring illustrations by Akamoku.

Yomiya Ririura began drawing a manga adaptation on the Shogakukan's Sunday Webry web service on March 26.

First Trailer

Note: The video is region-locked; click here for an alternative link.

Source: Comic Natalie