A Certain Item of Dark Side
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| 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 (Toaru Anbu no Aitemu) | |
|---|---|
| Genre | |
| Light novel | |
| Written by | Kazuma Kamachi |
| Illustrated by | Nilitsu |
| Published by | ASCII Media Works |
| Imprint | Dengeki Bunko |
| Original run | March 10, 2023 – present |
| Volumes | 6 |
| Manga | |
| Written by | Kazuma Kamachi |
| Illustrated by | strelka |
| Published by | ASCII Media Works |
| Imprint | Dengeki Comics NEXT |
| Magazine | Dengeki Daioh |
| Original run | October 27, 2023 – present |
| Volumes | 2 |
| Anime television series | |
| Directed by | Tatsuyuki Nagai |
| Music by | Maiko Iuchi |
| Studio | J.C.Staff |
| Original run | Q4 2026 – scheduled |
A Certain Item of Dark Side (Japanese: とある暗部の少女共棲, 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 Q4 2026.
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 | |
|---|---|---|---|
| 1 | March 10, 2023[5] | 978-4-04-914939-5 | |
| |||
| 2 | August 10, 2023[6] | 978-4-04-915081-0 | |
| 3 | June 7, 2024[7] | 978-4-04-915699-7 | |
| 4 | March 7, 2025[8] | 978-4-04-916233-2 | |
| 5 | September 10, 2025[9] | 978-4-04-916593-7 | |
| 6 | February 10, 2026[4] | 978-4-04-916884-6 | |
Manga
A manga adaptation illustrated by strelka began serialization in ASCII Media Works' shōnen manga magazine Dengeki Daioh on October 27, 2023.[10] The manga's chapters have been compiled into two tankōbon volumes as of April 2025.[11]
| No. | Release date | ISBN |
|---|---|---|
| 1 | June 26, 2024[12] | 978-4-04-915751-2 |
| 2 | April 24, 2025[11] | 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.[13] It is set to premiere in Q4 2026.[14]
