Shôwa Kayô Daizenshû plot
"The Complete Japanese Showa Songbook"
A group of boys, who call themselves the Gakis, pass their time hanging out and putting on large-scale karaoke performances of their favorite songs from the Showa era (popular Japanese music made between the 40s and 80s). Elsewhere in town, a group of middle-aged women, who call themselves the Midoris, are doing the same thing. One day, one of the Gakis kills one of the Midoris after she refuses to accept his advances. The Midoris don't stop there and take revenge by killing the one responsible for the death of one of them. The Gakis do not leave it at that and also want revenge. A spiral of revenge and violence is the result.