TL;DR, The film Kimi to Hanabi to Yakusoku to released a main trailer and visual and confirmed a Japan release on July 17, 2026. The theme song is by timelesz and new cast members include Rie Takahashi and Natsuko Yokosawa.

Warm night skies, a painting, and a promise set the tone. The official site dropped the main trailer and a new poster for the Kimi to Hanabi to Yakusoku to anime film, and confirmed a Japan theatrical opening on July 17, 2026. The preview also features the theme song by timelesz.

Based on Kaori Mado’s novel, the film follows two teens drawn together by fireworks. Shin-Ei Animation produces, with animation at SynergySP and The Answerstudio under director Akira Suzuki. Below are the key takeaways from the trailer, the release plan, and the cast and music highlights.

What the new Kimi to Hanabi to Yakusoku to trailer and visual show

The official website posted the main trailer today alongside a new key visual. The Kimi to Hanabi to Yakusoku to trailer runs to timelesz’s Kienai Hanabi, giving the footage a soft, reflective pull. The video leans on summer nights, quiet streets, and fireworks that echo the story’s promise.

The new image arrives with the video and keeps the focus on fireworks and intimacy. Text cards in the trailer close on the Japanese theatrical date. The cut avoids deep plot reveals, centering instead on mood, color, and the first sparks between the leads.

Sound and pacing do much of the work. Piano and vocal swells frame looks, pauses, and glances. The palette favors warm dusk tones, then bright bursts, matching the theme song’s lift into the chorus.

• Main trailer posted on the official site, with a companion Kimi to Hanabi to Yakusoku to visual.
• timelesz’s theme, Kienai Hanabi, plays through the cut and sets the tone.
• Title cards confirm the Japan opening date at the end of the video.
• Fireworks imagery anchors several shots, contrasting brief light with lingering emotion.
• Painting motifs appear, tying back to the novel’s inciting connection.
• Focus stays on the central pair’s first encounters and unspoken pull.
• Street scenes and riverside frames suggest a summer festival atmosphere.
• Editing favors gentle crossfades over jump cuts, matching the romance pacing.
• The sound mix places vocals forward, with percussive hits synced to bursts.
• Logo treatment and typography match prior teasers, reinforcing the brand identity.
• Color grading shifts from amber dusk to deep night blues as the song swells.
• The visual’s fireworks backdrop mirrors the trailer’s final chorus beat.

Kimi to Hanabi to Yakusoku to release date and studio details

The Kimi to Hanabi to Yakusoku to release date is set for Japanese theaters on July 17, 2026, according to the official site and the new video. That timing appears at the trailer’s close alongside the title. The date aligns the film with Japan’s peak summer movie window.

Shin-Ei Animation is producing the feature. Director Akira Suzuki leads animation at SynergySP and The Answerstudio. Shochiku will distribute the film in Japan, as listed with the production details shared alongside the trailer and visual.

Key staff credits were reiterated with the update. Kohei Mori wrote the screenplay. Yuji Watanabe adapts Akamoku’s original character designs for animation.

The project is sponsored by Niigata Prefecture, Nagaoka City, and the Niigata Prefecture Tourism Association, reflecting the story’s fireworks roots.

• Japan theatrical date: July 17 2026, matching the trailer end card.
• Producer: Shin-Ei Animation, as stated with the announcement.
• Animation production: SynergySP and The Answerstudio under Akira Suzuki.
• Director: Akira Suzuki, credited on Tower of God Season 2.
• Screenplay: Kohei Mori, providing the film’s script.
• Character design (animation): Yuji Watanabe, adapting Akamoku’s designs.
• Distributor: Shochiku, handling the domestic release.
• Sponsorship: Niigata Prefecture, Nagaoka City, and the prefecture’s tourism association.
• Source material: Kaori Mado’s romance novel about teens linked by a fireworks painting.
• Story backdrop: a famed fireworks festival setting that informs the film’s imagery.

Kimi to Hanabi to Yakusoku to cast, characters and the timelesz theme song

Shori Sato voices protagonist Makoto Natsume. Nanoka Hara (Suzume) is credited as the main heroine. Newly announced cast members are Rie Takahashi as a mysterious girl named Haru and comedian Natsuko Yokosawa as Makoto’s mother, Yukari Natsume.

The theme song, timelesz Kienai Hanabi, is featured in the trailer. timelesz, formerly known as Sexy Zone, performs the track, and group member Shori Sato headlines the film. The song’s reflective tone pairs with the film’s summer romance and fireworks motif.

“timelesz’s ‘Kienai Hanabi’ has been chosen as the theme song for the film. We can deliver this song with confidence. Fireworks may only shine for a moment, but they stay in your heart forever. I think we’ve made a theme like that. I hope it reaches you.”, Shori Sato

• Kimi to Hanabi to Yakusoku to cast highlights:
• Shori Sato as Makoto Natsume, the story’s viewpoint character.
• Nanoka Hara as the main heroine, linked to the fireworks painting.
• Rie Takahashi as Haru, a mysterious girl who crosses paths with Makoto.
• Natsuko Yokosawa as Yukari Natsume, Makoto’s mother.
• Theme: Kienai Hanabi performed by timelesz, featured in the trailer.
• Group note: timelesz is the new name of former Sexy Zone.
• Sato’s comment frames the song as fleeting light with lasting impact.
• Music and casting were confirmed via the film’s official channels.

Source: Crunchyroll