The staff behind the anime film adaptation of Kaori Mado‘s novel series You, Fireworks, and Our Promise (Kimi to Hanabi to Yakusoku to, or Kimi-Hana for short) released a “theme song mashup” promotional video on Thursday. The video showcases the film’s theme song “Kienai Hanabi” (Eternal Fireworks) performed by idol group timelesz, weaving together scenes of the main characters Makoto and Aki with real footage from the Nagaoka Festival Grand Fireworks Show.
Story
The coming-of-age romance unfolds against the backdrop of the Nagaoka Festival Grand Fireworks Show in Niigata Prefecture — one of Japan’s three great fireworks festivals, drawing hundreds of thousands of visitors each year. The story follows Makoto Natsume, a socially awkward and self-doubting high school boy from Tokyo, and Aki Hayama, a beautiful and talented class president. A mysterious drawing of a fireworks display brings the two together, setting them on a collision course with fate as they must make a crucial choice within a limited amount of time.
Cast
- Shōri Satō (of timelesz) — Makoto Natsume (protagonist)
- Nanoka Hara (Suzume, live-action Oshi no Ko, Mieruko-chan) — Aki Hayama (heroine)
- Rie Takahashi — Haru, the “mysterious girl”
- Natsuko Yokosawa — Yukari Natsume, Makoto’s mother
AVAM idol group members Nanami Saiki, Hanaka Kikyō, and Yuka Himemiya voice classmates of protagonist Makoto Natsume.
Staff
- Director: Kei Suzuki (assistant director on City Hunter The Movie: Angel Dust; Tower of God: Return of the Prince) — at Synergy SP and The Answer Studio
- Screenplay: Kōhei Mori
- Character Design: Yūji Watanabe
- Planning & Production: Michihiko Umezawa (The Dangers in My Heart, A Couple of Cuckoos) with Shinei Animation
- Original Script Concepts: Madoka Hosoya, michi
- Art Director: Toshiharu Mizutani
- Color Key Artist: Shiho Kuriki
- Compositing Director of Photography: Shinji Saitō
- Sound Director: Takeshi Takadera
- Music: Arisa Okehazama
- Distribution: Shochiku, Shinei Animation
- Promotional Collaboration: Showgate
- Sponsors: Niigata Prefecture, Nagaoka City, Niigata Prefectural Tourist Association
Background & Release
The film is based on Kaori Mado’s novel published by Shogakukan’s Gagaga Bunko imprint on December 18, 2025, with illustrations by Akamoku (The Girl Who Wants to Be a Hero and the Girl Who Ought to Be a Hero). A manga adaptation of the work is also currently in production.
The film received an early preview at the 79th Cannes International Film Festival on May 15 as part of the “Tokyo International Film Festival’s Goes to Cannes” event.
You, Fireworks, and Our Promise opens in Japanese theaters on July 17.
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