Kimi to Hanabi to Yakusoku to Film Adds Cast, Staff, Theme Song, Trailer
The casting of Rie Takahashi, a prominent voice actress, and the involvement of idol group timelesz signal a push for broad mainstream appeal beyond the light novel's existing readership.
Reporting from 2 sources: Anime Trending, MyAnimeList.
The official website for the anime film adaptation of Kaori Mado and Akamoku's light novel *Kimi to Hanabi to Yakusoku to* revealed additional cast, staff, the theme song, a key visual, and the first trailer on Tuesday. The film is scheduled to premiere in Japanese theaters on July 17. Rie Takahashi joins the cast as Haru, and Natsuko Yokosawa voices Yukari Natsume, the mother of protagonist Makoto Natsume. The idol group timelesz performs the theme song "Kienai Hanabi," which is previewed in the new trailer. Akira Suzuki directs the film at SynergySP and The Answer Studio, with a script by Kohei Mori and character designs by Yuuji Watanabe. The light novel was published in December 2025 under Shogakukan's Gagaga Bunko imprint. The story follows Makoto, who becomes involved with classmate Aki Hayama, who possesses a mysterious fireworks artwork and was told by her great-grandmother that she would meet someone named Makoto Natsume.
The film's production credits include staff members not listed in the initial announcement. Toshiharu Mizutani, known for Dungeon ni Deai wo Motomeru no wa Machigatteiru Darou ka, is the art director. Shiho Kuriki handles color design, and Shinji Saitou, who worked on City Hunter Movie: Tenshi no Namida, is the director of photography. Takeshi Takadera, sound director for [Oshi no Ko], serves as sound director. Alisa Okehazama, composer for Kusuriya no Hitorigoto, provides the music.
The script was written by Kohei Mori, with script drafts by Madoka Hosoya and michi. Yuuji Watanabe, who was an animation director on Fairy Tail Movie 2: Dragon Cry, designed the characters. Planning production is handled by Shin-Ei Animation.
Shori Sato, a member of timelesz, voices protagonist Makoto Natsume. The synopsis describes the story as a "fleeting" and "heart-rending love story" that "transcends time." The first trailer is region-locked, with an alternative link provided by the source.
Synthesized by Yomimono from the 2 cited sources below, including Japanese-language reporting where cited, then editorially reviewed before publishing.