Upcoming Romance Film You, Fireworks, and Our Promise Drops Breathtaking New Trailer

The official website for the highly anticipated anime feature film You, Fireworks, and Our Promise (known domestically in Japan as Kimi to Hanabi to Yakusoku to) has released a gorgeous new promotional trailer ahead of its theatrical premiere on July 17, 2026. The upcoming coming of age romance, produced by Synergy SP and The Answer Studio, adapts the celebrated light novel written by Kaori Mado. The fresh footage offers fans a direct preview of the movie core emotional hook alongside the sweeping theme song performed by popular J-pop group timelesz.

Key Information Directory

• Movie Title: You, Fireworks, and Our Promise (Kimi to Hanabi to Yakusoku to)
• Original Light Novel Creator: Kaori Mado
• Animation Production Studios: Synergy SP, The Answer Studio
• Planning and Production: Shin-Ei Animation
• Theatrical Release Date: July 17, 2026
• Theatrical Distributors: Shochiku, Shin-Ei Animation
• Genre: Coming of Age, Romance, Drama, Mystery
• Original Author Social Media Space: Kaori Mado Official X Account

What is the plot of You, Fireworks, and Our Promise?

The narrative constructs a poignant mystery out of a seemingly impossible family premonition. The story follows Makoto Natsume, a first year high school student living in Chōfu, Tokyo, who struggles heavily with social settings and lacks general self confidence. His quiet routine is abruptly shattered when he faces an unexpected confession from a fellow freshman named Aki Hayama.

Aki reveals a bizarre family secret: her grandmother explicitly spoke to her about meeting a specific boy named Makoto Natsume in the future. Because the two teenagers have never interacted before this moment, Makoto is immediately convinced that Aki is simply mistaking him for someone else. However, when Aki mentions an enigmatic, old painting depicting a brilliant display of fireworks, Makoto changes his mind. Intrigued by the anomaly, he agrees to help her track down the true target of her grandmother’s prediction. The following year, their joint investigation leads them directly to the historic region of Nagaoka, Niigata, where the mysterious properties of the drawing force them to make a life altering choice against a strict, ticking clock.

Who is in the cast of Kimi to Hanabi to Yakusoku to?

The cinematic adaptation features a star studded voice cast to bring its complex main duo to life. Pop star Shōri Satō, a prominent member of the idol group timelesz, steps into the recording booth to voice the introverted protagonist Makoto Natsume. Joining him as the co lead is acclaimed actress Nanoka Hara, who previously earned massive international recognition for voicing the titular heroine in Makoto Shinkai’s blockbuster film Suzume.

The audio experience is rounded out by the movie official theme song, titled Kienai Hanabi (which translates directly to Eternal Fireworks), composed and performed by timelesz. The track infuses the film’s trailer with an soaring, melancholic pop energy that mirrors the bittersweet narrative weight of the project.

When and where does the fireworks festival take place?

The core events of this romantic drama unfold during the real world Nagaoka Festival Grand Fireworks Show, which serves as a gorgeous visual centerpiece for the film. The production features authentic, detailed background footage modeled directly after the true to life festival grounds in Niigata Prefecture, an annual celebration that regularly draws hundreds of thousands of domestic and international tourists.

Held every year on August 2nd and 3rd, the Nagaoka show stands proudly as one of Japan’s three largest fireworks displays. The event carries a deep historical significance that informs the emotional undercurrent of the movie. It originally debuted in 1946 under the name Nagaoka Reconstruction Festival, organized to honor the memory of the victims who lost their lives during the tragic bombing of Nagaoka on August 1st, 1945, while offering community prayers for the city recovery.

Who are the creative staff behind the anime movie?

An experienced lineup of industry veterans was assembled to manage the transition from light novel pages to the silver screen. Kei Suzuki assumes the director chair, bringing extensive structural experience from his time as assistant director on City Hunter The Movie: Angel Dust and director of Tower of God: Return of the Prince. The baseline screenplay was penned by Kōhei Mori, with animation legend Yūji Watanabe handling the character designs.

The project structural assembly is managed by producer Michihiko Umezawa through Shin-Ei Animation, a veteran executive whose previous high profile production portfolios include hit romance properties like The Dangers in My Heart and A Couple of Cuckoos. Original script concepts were co developed by Madoka Hosoya and michi, while distribution is being jointly spearheaded by Shochiku and Shin-Ei Animation, with promotional assistance from Showgate. Furthermore, the movie features official, direct promotional support from the Niigata Prefectural Government, Nagaoka City, and the Niigata Prefectural Tourist Association, cementing its status as an authentic cultural tribute to the region.