is a Japanese manga series written and illustrated by Oreco Tachibana. It was serialized on Shogakukan's Ura Sunday manga website, under their "Girl's Club" label, and MangaONE app from January 2023 to February 2026. An anime television series adaptation produced by David Production is set to premiere in October 2026.

Plot Set during the Meiji era, Satoko Kirigaya is the daughter of an earl and renowned for her beauty and position. However, she does not have a lot of time left to live due to a heart condition; her only dream is to marry for the good of her family. However, her peaceful existence is unexpectedly disrupted by the attack of a mysterious assassin, Shinpei Goto. In desperation, Satoko proposes marriage. Although it was supposed to be a fake relationship, Shinpei proves to be a man full of love.

Shinpei takes Satoko to Tennyo Island, home to a flourishing red-light district, where she assumes the role of a courtesan while searching for a way to return to her family. During her stay, she becomes acquainted with the other courtesans and gradually develops feelings for Shinpei, despite his violent occupation, possessiveness, and unpredictable behavior. Their relationship is further complicated by the arrival of Kotaro Ogawa, a longtime acquaintance and bodyguard of the Kirigaya family, who attempts to bring Satoko home. As Satoko's feelings for Shinpei deepen, she begins to question her family's expectations and the marriage she had originally envisioned for herself.

Satoko subsequently discovers that her kidnapping was orchestrated by her father, Jubei Kirigaya, who intended to arrange a seemingly accidental encounter with a suitable marriage candidate. After Satoko refuses to return home without Shinpei, Jubei forcibly separates them and brings her back to the family estate. Determined to reunite with Shinpei, Satoko rejects her father's plans for her marriage, including a proposed engagement to Mitsuharu Okumura, the son of a duke. Although Mitsuharu initially attempts to win her affection, he eventually becomes involved in efforts to find treatment for her worsening heart condition. Satoko and Shinpei ultimately reunite and resolve to spend their remaining time together.

The couple return to Tennyo Island, where they hold a private wedding ceremony and begin living together. However, Satoko's health continues to deteriorate, and she eventually loses consciousness. Shinpei takes her to Mitsuharu's residence and mistakenly concludes that she has died and leaves her body with Mitsuharu. Overcome by grief, he leaves the island and spends the following decades traveling throughout Japan, without ever returning to visit Satoko's grave in the assumption that she had died.

Several decades later, an elderly Shinpei learns that Tennyo Island is set to be demolished and returns to visit the home he once shared with Satoko. There, he encounters Kotaro, who finally gives him a letter from Satoko that he has had for many years. The letter reveals that she somehow survived her illness after receiving treatment from a physician whom Mitsuharu had brought from overseas after Shinpei left her body. She had spent all those years waiting alone for Shinpei’s return. The series concludes with Shinpei visiting their former home, where he and Satoko reunite as elders after decades of separation.

Characters

Media Manga Written and illustrated by Oreco Tachibana, Firefly Wedding began serialization on Shogakukan's Ura Sunday manga website and MangaONE app on January 1, 2023. The series ended its main story on February 2, 2026, with seven spin-off chapters being released between February 2 and August 3, 2026. Its chapters have been collected into twelve volumes as of June 2026.

The series' chapters are published in English by Comikey. In May 2024, Viz Media announced that they would release volumes of the series in Q2 2025.

Anime An anime television series adaptation was announced on January 12, 2026. It will be produced by David Production and directed by Takahiro Kamei, with series composition handled Yūko Kakihara, characters designed by Yukiko Aikei, and music composed by Nogrid. The series is set to premiere on October 9, 2026, on the Noitamina programming block on Fuji TV and its affiliates. The opening theme song is "Period", performed by Iri, and the ending theme song is , performed by Tooboe. Crunchyroll will stream the series. Muse Communication licensed the series in Southeast Asia.

Other media A voice comic commemorating the release of the first volume was released on Flower Comics' YouTube channel on June 19, 2023. A television commercial and promotional video commemorating the release of the second volume was released on MangaONEs YouTube channel on September 12, 2023. The voice comic features the performances of Yui Ishikawa as Satoko Kirigaya and Koki Uchiyama as Shinpei Goto, while the promotional video and commercial features only Uchiyama reprising his role as Shinpei.

Reception The series had 4 million copies in circulation by September 2025.

The series was ranked fifth for the Tsutaya Comic Award. The series also ranked ninth in the 2024 edition of Takarajimasha's Kono Manga ga Sugoi! guidebook for the best manga for female readers. The series won the grand prize at NTT Solmare's Digital Comic Awards in 2024. The series was ranked first in the Nationwide Bookstore Employees' Recommended Comics list of 2024. The series was also nominated for the 48th Kodansha Manga Award in the category. The series was ranked tenth in the web category for the 2024 Next Manga Awards. The series was ranked third in AnimeJapan's "Manga We Want to See Animated" poll in 2025. The series was nominated for the 71st Shogakukan Manga Award.

See also Promise Cinderella, another manga series by the same author

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