A Certain Item of Dark Side

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 three 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 a single tankōbon volume. An anime television series adaptation has been announced.

A Certain Item of Dark Side
First light novel volume cover
とある暗部の少女共棲（アイテム） (Toaru Anbu no Aitemu)
Genre	Action Science fiction
Light novel
Written by	Kazuma Kamachi
Illustrated by	Nilitsu
Published by	ASCII Media Works
Imprint	Dengeki Bunko
Demographic	Male
Original run	March 10, 2023 – present
Volumes	3
Manga
Written by	Kazuma Kamachi
Illustrated by	strelka
Published by	ASCII Media Works
Imprint	Dengeki Comics NEXT
Magazine	Dengeki Daioh
Demographic	Shōnen
Original run	October 27, 2023 – present
Volumes	1
Anime television series

Characters

Shizuri Mugino (麦野沈利, Mugino Shizuri)

Voiced by: Ami Koshimizu^[1]

Rikou Takitsubou (滝壺理后, Takitsubou Rikou)

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]

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. Three volumes have been released as of June 7, 2024.^[2]

No.	Release date	ISBN
1	March 10, 2023[3]	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)
2	August 10, 2023[4]	978-4-04-915081-0
3	June 7, 2024[2]	978-4-04-915699-7
4	March 7, 2025[5]	978-4-04-916233-2

Manga

A manga adaptation illustrated by strelka began serialization in ASCII Media Works' shōnen manga magazine Dengeki Daioh on October 27, 2023.^[6] The manga's chapters have been compiled into a single tankōbon volume of June 2024.^[7]

No.	Release date	ISBN
1	June 26, 2024[7]	978-4-04-915751-2

Anime

An anime television series adaptation was announced during the "Dengeki Bunko Winter Festival 2025" livestream event on February 16, 2025.^[1]

Notes

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

References

1. Tai, Anita (February 16, 2025). "Toaru Anbu no Item Spinoff Novels Get TV Anime". Anime News Network. Retrieved February 16, 2025.
2. とある暗部の少女共棲（３） (in Japanese). ASCII Media Works. Retrieved February 16, 2025.
3. とある暗部の少女共棲 (in Japanese). ASCII Media Works. Retrieved February 16, 2025.
4. とある暗部の少女共棲（２） (in Japanese). ASCII Media Works. Retrieved February 16, 2025.
5. とある暗部の少女共棲（４） (in Japanese). ASCII Media Works. Retrieved February 16, 2025.
6. 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.
7. とある暗部の少女共棲１ (in Japanese). ASCII Media Works. Retrieved February 16, 2025.

External links

• Manga official website at KadoComi (in Japanese)
• A Certain Item of Dark Side (light novel) at Anime News Network's encyclopedia