Switch

Product brand

Switch is a Japanese crime manga series about two undercover narcotics investigators confronting drug syndicates and the hidden trauma behind one investigator's violent alter ego.

Last updated August 25, 2026

AI crawler reads

No AI crawler has read this profile since Oct 28, 2026.

Overview

Switch, stylized as switch, is a Japanese manga series written by Otoh Saki and illustrated by Tomomi Nakamura. It was serialized in Square Enix's GFantasy magazine from 2002 through October 2008 and collected in 13 tankōbon volumes. The first collected volume was published on June 21, 2002, while the final volume appeared on December 27, 2008. The series was published within the Japanese manga market under Square Enix's publishing operations and later received an animated video adaptation and character-focused music releases. The story follows Kai Etō and Hal Kurabayashi, two new investigators assigned to the Kantō regional Narcotics Control Department. Their cases involve drug dealers, organized gangs, murderers, psychologically unstable criminals, and the drug-smuggling organization Ryuugen. Although the series uses the framework of police and crime fiction, its central tension is psychological: Kai is normally gentle, compassionate, and reluctant to hurt others, but extreme pain or emotional distress can trigger a violent alter ego. This transformation is connected to childhood trauma, the killing of his parents, the intervention of Hal's father, and the mysterious drug known as "switch." Hal is presented as Kai's highly capable partner. He is focused, perceptive, and willing to use charm and social manipulation during investigations. His outwardly detached manner contrasts with his protectiveness toward Kai, making the partnership one of the series' principal emotional anchors. The wider cast includes Narcotics Control Department leaders and investigators such as Masataka Hiki and Keigo Kajiyama, as well as outside detective Akimune Narita and narcotics specialist Mari Kuzui. The opposing Ryuugen organization is represented by figures including Sawaki and Akaha, whose histories are also tied to violence, loyalty, and exploitation. The manga's narrative combines procedural investigations with serialized revelations about Kai's identity, memory, family history, and alter ego. The effort to dismantle Ryuugen gradually exposes connections between the criminal organization and Kai's past. This structure allows the series to move between case-based action, character drama, and darker psychological material rather than functioning only as a conventional police thriller. Switch was adapted into two original video animations by Actas. The adaptation was announced in June 2008, with the first OVA released on October 24, 2008, and the second scheduled for February 25, 2009. The production was directed by Naoki Oohira. The anime releases used the opening song "Find Out" and ending song "Your Hand," both performed by MIRANOSAND. Square Enix also issued four vocal CDs centered on individual characters between October 2004 and January 2005. Reception was mixed. Reviews cited strengths including clean linework and occasional wordless scenes that created emotional impact, while criticisms focused on confusing action staging, awkward plotting, and uneven story development. The manga's identifiable commercial life therefore rests primarily on its completed 13-volume publication, its OVA adaptation, and associated character music rather than on an ongoing brand or current franchise program.

History

Switch was created by writer Otoh Saki and artist Tomomi Nakamura as a Japanese crime manga centered on investigators in the Narcotics Control Department. Square Enix began publishing the series in GFantasy in 2002. The first tankōbon volume was released on June 21, 2002, establishing the collected edition that would eventually comprise 13 volumes. The series follows new investigators Kai Etō and Hal Kurabayashi as they work cases involving narcotics trafficking, gangs, murder, and concealed criminal networks. Its main long-form conflict concerns Ryuugen, a notorious drug-smuggling organization. While Hal is portrayed as an analytical and resourceful investigator, Kai's characterization is built around a severe psychological split. Under intense emotional pressure, a violent alter ego can emerge, creating both an investigative asset and a threat to Kai's identity and relationships. As the story develops, Kai's past becomes increasingly important. His parents were killed when he was a child, and the trauma is linked to the emergence of his violent persona. Later revelations connect his memory, the intervention of Hal's father, and the fictional drug called "switch." The resulting plot combines police work with questions about memory, identity, conditioning, and the consequences of violence. The supporting cast expands the procedural setting through department directors, rival detectives, research specialists, and members of Ryuugen. Switch continued in GFantasy until October 2008. The final collected volume was published by Square Enix on December 27, 2008, bringing the manga to 13 volumes. During the final phase of the print serialization, the property also moved into animation. Actas produced two original video animations, with the first released on October 24, 2008 and the second scheduled for February 25, 2009. Naoki Oohira directed the animated project. Its music included the opening theme "Find Out" and ending theme "Your Hand," performed by MIRANOSAND. The franchise also generated four Square Enix vocal CDs built around characters from the manga. Releases were issued from October 2004 through January 2005 and featured songs associated with Kai Etō, Masataka Hiki, Keigo Kajiyama, and Hal Kurabayashi. These products extended the series beyond the manga without changing its core identity as a completed crime-fiction property. Critical response was uneven. Some commentary praised Nakamura's clean linework and the emotional force of selected quiet scenes. Other reviews found the plotting awkward, the action difficult to follow, and some story lines mediocre. The available record does not establish a continuing publication program, a current corporate brand strategy, or a later major adaptation, so Switch is best treated as a completed manga and related media property rather than an active consumer brand.

2009
Second OVA scheduled
[1]Switch (manga)en.wikipedia.org
The second OVA was scheduled for release on February 25, 2009.
2008
Manga serialization ended
[1]Switch (manga)en.wikipedia.org
Serialization concluded in GFantasy in October 2008.
2008
First OVA released
[1]Switch (manga)en.wikipedia.org
Actas released the first original video animation on October 24, 2008.
2008
Final collected volume published
[1]Switch (manga)en.wikipedia.org
The thirteenth and final tankōbon volume was published on December 27, 2008.
2004
Character vocal CD series began
[1]Switch (manga)en.wikipedia.org
The first of four character vocal CDs, centered on Kai Etō, was released on October 22, 2004.
2002
Manga serialization began
[1]Switch (manga)en.wikipedia.org
Switch began serialization in Square Enix's GFantasy magazine.
2002
First collected volume published
[1]Switch (manga)en.wikipedia.org
Square Enix released the first tankōbon volume on June 21, 2002.

Products and positioning

A dark Japanese crime and psychological-action manga combining narcotics investigations, organized-crime conspiracies, trauma, and a partnership between two young investigators.

Manga series · 2002
Switch manga
The core product is a 13-volume Japanese crime manga written by Otoh Saki and illustrated by Tomomi Nakamura. Published through Square Enix and serialized in GFantasy from 2002 to October 2008, it follows Narcotics Control Department investigators Kai Etō and Hal Kurabayashi. The narrative combines investigations into drug organizations with psychological revelations concerning Kai's traumatic childhood and violent alter ego.
Original video animation · 2008
Switch OVAs
Actas produced a two-part animated adaptation of the manga. The first OVA was released on October 24, 2008, with the second scheduled for February 25, 2009. The adaptation carries the manga's police-investigation and organized-crime premise into animated form and was directed by Naoki Oohira.
Character music · 2004
Switch character vocal CDs
Square Enix released four vocal CDs linked to principal characters. The releases featured songs associated with Kai Etō, Masataka Hiki, Keigo Kajiyama, and Hal Kurabayashi, and were issued between October 2004 and January 2005 as a music expansion of the manga property.

Brand decisions

2008
Animated adaptation commissionedProduct launch
Background
After the manga had established its crime-investigation storyline and serialized run, an animated adaptation was announced in June 2008.
Action taken
Actas produced two original video animations directed by Naoki Oohira, with the first released in October 2008.
Aftermath
The project extended Switch into animation during the period in which the manga was approaching its conclusion.
Source

Recent events

2009
Second Switch OVA released[1]Switch (manga)en.wikipedia.org
Product launch
The second installment of the Actas original video animation project was scheduled for release on February 25, 2009.
2008
Switch serialization concluded in GFantasy[1]Switch (manga)en.wikipedia.org
Other
The manga's serialization in Square Enix's GFantasy magazine ended in October 2008.
2008
Switch manga concluded with its thirteenth collected volume[1]Switch (manga)en.wikipedia.org
Product generation
Square Enix published the final collected volume of the series on December 27, 2008, completing the 13-volume manga run.
2008
Switch received an Actas OVA adaptation[1]Switch (manga)en.wikipedia.org
Product launch
An animated adaptation was announced in June 2008, and the first original video animation was released on October 24 of that year.

Sources9 sources

Cite this profile: Cite the canonical profile. /brand-wiki/switch · Editorial policy · How profiles are compiled