Kaori Mado is a Japanese writer known for creating the original light novel Kimi to Hanabi to Yakusoku to. Information about Mado's personal background, including date of birth, place of origin, and career prior to 2025, is not documented in available sources. Mado maintains a presence on social media under the handle @madokaori_mado.

Mado is credited as the author of the single-volume light novel Kimi to Hanabi to Yakusoku to, which translates to You, Fireworks, and Our Promise. The story was originally serialized online on the Note website from August 4 to October 27, 2025. Shogakukan subsequently acquired the novel and published it in print on December 18, 2025, under the publisher's Gagaga Bunko imprint. The novel features illustrations by the artist Akamoku.

The story follows Makoto, a timid middle school student, and his classmate Aki, who possesses a special drawing of fireworks passed down from her great-grandmother. Aki has been told she will one day meet someone named Makoto Natsume, and the two work together to uncover the mystery behind the artwork and a promise that spans eighty-one years. The narrative is set against the backdrop of the Nagaoka Festival Fireworks Display in Niigata Prefecture, one of Japan's three major fireworks festivals.

A manga adaptation of the light novel, illustrated by Ririura Yomiya, launched in Shogakukan's Sunday Webry on March 26, 2026. An anime film adaptation produced by Shin-Ei Animation and animated by SynergySP and The Answer Studio is scheduled to premiere in Japan on July 17, 2026. Kei Suzuki is directing the film, with a screenplay by Kohei Mori. The film stars Shori Sato as Makoto Natsume and Nanoka Hara as Aki Hayama.

Kaori Mado's professional activity centers on this single published work, which has generated both manga and anime adaptations in rapid succession following its print release. No other original manga, light novel series, or anime creations by Mado are documented in available sources.