“Kimi to Hanabi to Yakusoku to” is a bittersweet yet heartwarming love story depicting beautiful fireworks scenery, youth, and a promise passed down across time. The story begins with the meeting between high school student Natsume Makoto and Hayama Akira, a girl with a somewhat mysterious aura. Despite it being their first meeting, Akira smiles and says, “I've wanted to meet you for so long.” Hidden behind those words was a secret surrounding a single painting of fireworks that had been cherished and handed down since childhood. Although confused, as Makoto interacts with Akira, he gradually regains his forgotten passion for drawing. However, he begins to struggle with conflict over whether he might not be the person Akira believes him to be, and the distance between the two gradually sways.

The fireworks festival in Nagaoka City, Niigata Prefecture, which serves as the setting of the story, is depicted not merely as a background, but as an important presence symbolizing the work itself. The overwhelming scale unique to one of Japan's leading fireworks festivals and the scenery spreading across the night sky overlap brilliantly with the characters' emotions, enveloping the entire work in a mystical atmosphere. Makoto pursues Akira, who suddenly disappeared, and visits Nagaoka to discover the truth hidden in the single painting of fireworks. What he encounters there is Haru, a mysterious girl whose clothing and way of speaking do not seem to belong to the modern era. Triggered by the meeting with her, the past and present gradually begin to intersect, and the true meaning held by the painting of fireworks and the promise kept secret for many years slowly come to light.

A major charm of this work lies in its deep narrative quality that does not end as a mere romance story. The feelings of people living in their respective eras, past and present, connect like a single thread, and one is naturally drawn into a plot development where small events come to hold great significance across decades. The figures of the characters thinking of someone within limited time and choosing their future while facing themselves are very delicate and touching. The preciousness of a “promise” that remains unchanged even across the great barrier of time gently wraps around the entire story, and the emotion swells even larger as it heads toward the climax.

Makoto is by no means a protagonist with special abilities, but a relatable high school student who struggles with a lack of self-confidence yet tries to move forward step by step. That figure becomes a charm that many readers can empathize with. On the other hand, Akira has a bright and pure personality, yet is a presence that somehow conveys fragility, and the secret hidden behind her smile colors the story even more bittersweetly. And the mysterious girl, Haru, leaves a strong impression as a key presence holding the story's secrets. Because the feelings and wishes held by each character are depicted with care, it is easy to emotionally invest as you read on, making them characters everyone wants to root for. What remained most impressionable after finishing reading was the weight of a “promise.” It makes one feel anew that connections between people never disappear even if eras change, and that feelings of caring for someone are passed down across long years. Furthermore, the direction in which fireworks, an existence symbolizing beauty that disappears in an instant, are contrasted with feelings that remain forever is also extremely beautiful, making the lingering resonance of the entire story even deeper. The bittersweetness of youth, mystery, and fantasy fuse in an exquisite balance, drawing me into the world without getting bored until the very end.

“Kimi to Hanabi to Yakusoku to” is a moving work that carefully depicts not only romance but also family bonds, destiny, and feelings passed down across time against the backdrop of beautiful fireworks scenery. The mysterious story starting from a single painting of fireworks will likely make each reader think about “promises with important people.” It is a work where bittersweetness and warmth remain in the heart simultaneously, and it is a work I would highly recommend to anyone who wants to enjoy beautiful scenic descriptions, meticulously laid foreshadowing, and a moving story. After reading, the momentary fireworks blooming in the night sky should feel even more special than ever before.