Karaoke Terror (The Complete Japanese Showa Songbook) (Japanese, Subtitled in English)

From the mind of writer Ryu Murakami (AUDITION) comes the satirical tale of two groups of outsiders who make war on each other, set to a soundtrack of retro karaoke hits. A gang of young slacker guys (the Gakis) idle away their time just hanging out, their sole passion in life being elaborate karaoke recreations of their favorite Showa-era songs (oldies from the 40s to the 80s).
Across town, a group of thirty-something divorced women calling themselves the Midoris do much the same thing, until one of the Gakis kills a Midori after he's rejected trying to pick her up. The Midoris retaliate, and the absurdist battle of revenge is on, with weapons escalating from knives to guns and eventually to rocket launchers and beyond. A pitch-black comedy of violence filled with rage at the status quo and a seething impatience for the ordinary, KARAOKE TERROR captures the angst and spiritual restlessness of two very different generations, both abandoned by society and seeking payback with apocalyptic results.