9mm Parabellum Bullet was formed in March of 2004. Their name comes from their drummer, Kamijou Chihiro, who is a graduate of a soldier/finishing school. They recorded two early mini-albums, Gjallarhorn in 2005 and Phantomime in 2006, encompassing a variety of genres, including hardcore, punk, metal, pop, and emo, accentuated by their own fast-paced sound. 2007 saw the releases of the Discommunication e.p., featuring "Discommunication" and a 25 minute live track, and The World e.p.

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