2002年金子勇开发完成了革新软件“Winny”后，瞬间引发超强效应。与此同时，网络上出现了大量违法下载的作品，事态愈演愈烈，2004年开发人金子勇也被逮捕。此时，熟悉电脑犯罪犯罪的律师壇俊光组成律师团队，为其进行辩护。

In 2008, an indiscriminate killing which shocked the whole world was carried out in the street of Akihabara. Director Yûsaku Matsumoto was inspired by the Akihabira killing to look at random acts of violence occurring in Japanese society and exploring the aftermath of one such occurrence, and the building-up to another one. By following several people—perpetrators, victims and family of both alike, he tells a human story about inhumane acts.