12012 is a Japanese rock band. Formed in 2003 in Osaka Prefecture, the group centers its work around the concept of "madness inside a human" (人間の内面における狂気 ningen no naimen ni okeru kyōki). 12012 is also the penal code for the possession of a dangerous weapon in California. blank">Tokidoki 12012 Interview Retrieved on 2007-09-16 The group sometimes performs as "kyōki shoji" (凶器所持), which is a translation of that offense. They are a visual kei band, and consider their appearance as part of they way they express their music. For us, the visual aspect of the band is very important, because it’s another way for us to express our music. It’s not just music or just visual, it’s like a pair. Tokidoki 12012 Interview Retrieved on 2007-09-16

In 2007, the band performed the ending theme, Cyclone, to the _Gonzo anime TV series, Romeo x Juliet, its single being released by Universal Music Japan on June 13, 2007. The group has also toured Japan on many occasions as well as performing at concerts in numerous international locations.

On January 23, 2008 it was announced that 12012 will be performing in America for a 3rd time at the Clash Against Commercialism rock event along with several other Japanese rock bands. The event will be held at the Nokia Theatre Times Square in New York City on April 6, 2008.

In September 2007, vocalist Miyawaki Wataru was arrested for assault on a woman. After a night of heavy drinking, it was reported he had tried to strangle a female acquaintance. It was resolved out of court, and the charges were later dropped. On October 17, 2007, Wataru posted an apology in his blog.