Fushi Tantei Reidō Momiji

Fushi Tantei Reidō Momiji
First light novel volume cover
不死探偵・冷堂紅葉
GenreMystery
Light novel
Written byShizuku Rei
Illustrated byRag Miwano
Published bySB Creative
ImprintGA Bunko
Original runJuly 14, 2023 – present
Volumes3

Fushi Tantei Reidō Momiji (不死探偵・冷堂紅葉; lit. "Immortal Detective Momiji Reidō") is a Japanese light novel series written by Shizuku Rei and illustrated by Rag Miwano. The series began publication under SB Creative's GA Bunko imprint in July 2023; three volumes have been released as of August 2025.

Plot

The series follows Haruma Amanai, a high school student and a fan of detective novels. One day, a new student named Momiji Reidō transfers to his class. While touring Momiji around the school, they discover that one of their classmates, Yamato Sasamura, had been murdered. The two decide to investigate Yamato's murder, taking advantage of Haruma's time travel powers and Momiji's immortality.

Characters

Haruma Amanai (天内 晴麻, Amanai Haruma)
A high school student. He is interested in detective novels and runs his own literature study group, separate from the school's main Literature Club. He is an expert in kendo. He has the ability to go back in time by kissing.
Momiji Reidō (冷堂 紅葉, Reidō Momiji)
A new student who transferred to Haruma's class. Despite appearances, she is actually 24 years old, being immortal. She also becomes a member of Haruma's literature group.

Publication

The series is written by Shizuku Rei and illustrated by Rag Miwano. The novel was originally submitted to a competition run by SB Creative's GA Bunko imprint under the title Kimi to Saigo no Kiss o Suru (君と最後のキスをする, Kimi to Saigo no Kisu o Suru), later being chosen as one of four Silver Award winners.[1] Rei had an interest in mystery novels since junior high school, finding satisfaction in following mysteries and solving puzzles; they also cited the visual novel series Umineko When They Cry as an inspiration.[2] They were inspired to write the novel after watching Evangelion: 3.0+1.0 Thrice Upon a Time;[2] the novel's original title was a reference to Hikaru Utada's song "One Last Kiss", which was used in the film.[3] SB Creative released the first volume on July 14, 2023;[4] three volumes have been released as of August 2025.[5]

No. Japanese release date Japanese ISBN
1 July 14, 2023[4]978-4-8156-2149-0
2 November 15, 2023[6]978-4-8156-2150-6
3 August 12, 2025[5]978-4-8156-3656-2

Reception

The series ranked highly in multiple surveys by the website Anime! Anime! on light novels that people wanted to see adapted into an anime, ranking 2nd for the first half of 2024,[7] and 1st for the second half of 2024 and the first half of 2025.[8][9] The first and second volumes received multiple awards from the Ranobe News Online Awards in 2023.[10][11] The series was included in the 2024 edition of Kono Light Novel ga Sugoi!, ranking 12th in the paperback category and 8th in the new release category.[12]

References

  1. ^ "第15回GA文庫大賞の総合結果が発表 4年ぶりとなる「大賞」に1作品が選出など". LN-News.com (in Japanese). April 30, 2023. Retrieved August 28, 2025.
  2. ^ a b "独占インタビュー「ラノベの素」 零雫先生『不死探偵・冷堂紅葉』". LN-News.com (in Japanese). August 12, 2025. Retrieved August 28, 2025.
  3. ^ @rei_shizuku111 (November 13, 2023). ""①シンエヴァを観て創作意欲が湧く ②なんかお話を作ってみようと思って、不死探偵を書いて受賞"" (Tweet) (in Japanese). Retrieved August 28, 2025 – via Twitter.
  4. ^ a b "不死探偵・冷堂紅葉 01.君とのキスは密室で" (in Japanese). SB Creative. August 28, 2025.
  5. ^ a b "不死探偵・冷堂紅葉 03.君への挑戦状" (in Japanese). SB Creative. August 28, 2025.
  6. ^ "不死探偵・冷堂紅葉 02.君に遺す『希望』" (in Japanese). SB Creative. August 28, 2025.
  7. ^ "アニメ化してほしいライトノベル・小説は？ 3位「あやかし課」、2位「不死探偵」、1位は…＜24年上半期版＞". Anime! Anime! (in Japanese). June 24, 2024. Retrieved August 28, 2025.
  8. ^ "アニメ化してほしいライトノベル・小説は？ 3位「恋した人は」、2位「おまわりさんと招き猫」、1位は…＜24年下半期版＞". Anime! Anime! (in Japanese). December 20, 2024. Retrieved August 28, 2025.
  9. ^ "アニメ化してほしいライトノベル・小説は？ 3位「おまわりさんと招き猫」、2位「魔術漁りは選び取る」、1位は…＜25年上半期版＞". Anime! Anime! (in Japanese). June 28, 2025. Retrieved August 28, 2025.
  10. ^ "ラノベニュースオンラインアワード2023年7月刊の投票アンケート結果を発表". LN-News.com (in Japanese). September 6, 2023. Retrieved August 28, 2025.
  11. ^ "ラノベニュースオンラインアワード2023年11月刊の投票アンケート結果を発表". LN-News.com (in Japanese). January 7, 2024. Retrieved August 28, 2025.
  12. ^ "『このライトノベルがすごい！2024』受賞作特集" (in Japanese). Kadokawa Corporation. Archived from the original on June 24, 2025. Retrieved August 28, 2025.
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