Audition writer Ryu Murakami returns to shock and surprise movie lovers with this darkly satirical comedy about an absurd street war between two gangs of violent, karaoke-loving outsiders. The Gakis are a gang of young slackers whose primary passion in life is staging elaborate karaoke recreations of the nostalgic, Showa-era songs (classic hits from the 1940s to the 1980s) they grew up on. The Midoris are a group of thirty-something female divorcees who share a similar passion for classic karaoke hits, yet despite their similar interests these two crews are about to become locked on a cataclysmic collision course. When a Gaki is rejected while trying to pick up a Midori, the humiliation proves too hard to handle and he instinctively kills the woman. The Midoris quickly retaliate, and the war is on. At first both gangs rely on knives and guns to exact their vicious revenge, but before long a simple bullet just won't suffice. As the violence escalates and both gangs up the ante by securing increasingly advanced and destructive weaponry, two generations forgotten by society clash in an explosive frenzy of apocalyptic fury.