A Certain Item of Dark Side

A Certain Item of Dark Side
First light novel volume cover, featuring Frenda Seivelun and Shizuri Mugino
とある暗部の少女共棲（アイテム）
(Toaru Anbu no Aitemu)
Genre
Light novel
Written byKazuma Kamachi
Illustrated byNilitsu
Published byASCII Media Works
ImprintDengeki Bunko
Original runMarch 10, 2023 – present
Volumes6
Manga
Written byKazuma Kamachi
Illustrated bystrelka
Published byASCII Media Works
ImprintDengeki Comics NEXT
MagazineDengeki Daioh
Original runOctober 27, 2023 – present
Volumes2
Anime television series
Directed byTatsuyuki Nagai
Music byMaiko Iuchi
StudioJ.C.Staff
Original networkTokyo MX
Original run October 10, 2026 – scheduled

A Certain Item of Dark Side (Japanese: とある暗部の少女共棲（アイテム）, Hepburn: Toaru Anbu no Aitemu)[a] is a Japanese light novel series written by Kazuma Kamachi and illustrated by Nilitsu, which is a spin-off of Kamachi's A Certain Magical Index series, focusing on the women belonging to Academy City's dark side. ASCII Media Works have published six volumes since March 2023 under their Dengeki Bunko imprint. A manga adaptation with art by strelka has been serialized in ASCII Media Works' shōnen manga magazine Dengeki Daioh since October 2023 and has been collected in two tankōbon volumes. An anime television series adaptation produced by J.C.Staff is set to premiere in October 2026.

Plot

Inside Academy City exists ITEM, an elite group of four girls: Rikou Takitsubo, who can track the powers emitted by espers; Frenda Seivelun, who excels in combat; Saiai Kinuhata, who can control nitrogen; and Shizuri Mugino, who is one of Academy City's seven Level 5s. They live in the underworld of Academy City and are devoted to carrying out their mission.

Characters

Shizuri Mugino (麦野沈利, Mugino Shizuri)
Voiced by: Ami Koshimizu[1]
Rikou Takitsubo (滝壺理后, Takitsubo Rikō)
Voiced by: Aya Suzaki[1]
Frenda Seivelun (フレンダ セイヴェルン, Furenda Seivuerun)
Voiced by: Maaya Uchida[1]
Saiai Kinuhata (絹旗最愛, Kinuhata Saiai)
Voiced by: Chinatsu Akasaki[1]
Chōbi Hanano (華野超美, Hanano Chōbi)
Voiced by: Hana Hishikawa[2]

Media

Light novels

Written by Kazuma Kamachi and illustrated by Nilitsu, A Certain Item of Dark Side began publication under ASCII Media Works' Dengeki Bunko light novel imprint on March 10, 2023.[3] Six volumes have been released as of February 10, 2026.[4]

No. Release date ISBN
1March 10, 2023[5]978-4-04-914939-5
  • Prologue: Feminine, Dangerous, Bright (序章 フェミニンデンジャラスブライト)
  • Chapter 1: The Fifth Girl (第一章『五』人目の少女)
  • Chapter 2: >>Colosseum. (第二章 >>Colosseum.)
  • Chapter 3: A Certain Courage, A Secret Reward (第三章 とある勇気、秘密の報酬)
  • Chapter 4: Level 5 Roars (第四章 超能力者は咆哮する)
  • Epilogue: A Road That Leads to Somewhere Someday (終章 いつかどこかに繋がる道)
2August 10, 2023[6]978-4-04-915081-0
3June 7, 2024[7]978-4-04-915699-7
4March 7, 2025[8]978-4-04-916233-2
5September 10, 2025[9]978-4-04-916593-7
6February 10, 2026[4]978-4-04-916884-6
7October 9, 2026[10]978-4-04-952405-5

Manga

A manga adaptation illustrated by strelka began serialization in ASCII Media Works' shōnen manga magazine Dengeki Daioh on October 27, 2023.[11] The manga's chapters have been compiled into two tankōbon volumes as of April 2025.[12]

No. Release date ISBN
1June 26, 2024[13]978-4-04-915751-2
2April 24, 2025[12]978-4-04-916381-0

Anime

An anime television series adaptation was announced during the "Dengeki Bunko Winter Festival 2025" livestream event on February 16, 2025.[1] The series is produced by J.C.Staff and directed by Tatsuyuki Nagai, with Shigeki Kimoto designing the characters and Maiko Iuchi composing the music.[14] It is set to premiere in October 10, 2026, on Tokyo MX and other networks.[15][16] The opening theme song is "Ghost Sequence", performed by East of Eden, and the ending theme song is "Genshi Kuzushi (Meltdowner)" (原子崩し（メルトダウナー）), performed by Kisida Kyodan & The Akebosi Rockets.[16]

Notes

  1. ↑ The kanji 少女共棲 in the Japanese title is read as Shōjo Kyōsei.

References

  1. 1 2 3 4 5 Tai, Anita (February 16, 2025). "Toaru Anbu no Item Spinoff Novels Get TV Anime". Anime News Network. Retrieved February 16, 2025.
  2. ↑ Cayanan, Joanna (March 28, 2026). "Toaru Anbu no Item Anime Casts Hana Hishikawa". Anime News Network. Retrieved March 28, 2026.
  3. ↑ Hazra, Adriana (January 2, 2023). "Kazuma Kamachi Launches 'A Certain' Series Spinoff Novels About ITEM Group in March". Anime News Network. Retrieved February 25, 2025.
  4. 1 2 とある暗部の少女共棲（6） (in Japanese). ASCII Media Works. Retrieved December 24, 2025.
  5. ↑ とある暗部の少女共棲 (in Japanese). ASCII Media Works. Retrieved February 16, 2025.
  6. ↑ とある暗部の少女共棲（2） (in Japanese). ASCII Media Works. Retrieved February 16, 2025.
  7. ↑ とある暗部の少女共棲（3） (in Japanese). ASCII Media Works. Retrieved February 16, 2025.
  8. ↑ とある暗部の少女共棲（4） (in Japanese). ASCII Media Works. Retrieved February 16, 2025.
  9. ↑ とある暗部の少女共棲（5） (in Japanese). ASCII Media Works. Retrieved August 19, 2025.
  10. ↑ とある暗部の少女共棲（7） (in Japanese). ASCII Media Works. Retrieved August 10, 2026.
  11. ↑ Cayanan, Joanna (April 28, 2023). "'A Certain' Series' Toaru Anbu no ITEM Spinoff Novels Get Manga Adaptation (Updated)". Anime News Network. Retrieved February 16, 2025.
  12. 1 2 とある暗部の少女共棲2 (in Japanese). ASCII Media Works. Retrieved March 1, 2025.
  13. ↑ とある暗部の少女共棲1 (in Japanese). ASCII Media Works. Retrieved February 16, 2025.
  14. ↑ Cayanan, Joanna (February 22, 2026). "Toaru Anbu no Item TV Anime Unveils Main Staff, 2026 Debut". Anime News Network. Retrieved February 22, 2026.
  15. ↑ Loo, Egan (March 26, 2026). "Toaru Anbu no Item TV Anime's Teaser Unveils Musical Composer, Fall Debut". Anime News Network. Retrieved March 27, 2026.
  16. 1 2 Dempsey, Liam (July 3, 2026). "A certain dark item Anime Trailer Reveals Premiere Date, Theme Song". Crunchyroll. Retrieved July 3, 2026.
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