The story takes place in Japan in 2020, and the promulgation of a law called the Revenge Law has led the Japanese people into a new legal era. The Vengeance Act stipulates that all those who want to avenge the dead will be sent with the killer to the isolated island of Snake Rock in the Pacific Ocean, where the Avengers will be given sophisticated weapons and positioning devices, and in the next 18 hours, no matter what kind of violence occurs, the government will not be held accountable, but if the Avengers fail to kill the killer, the killer will be acquitted. Because the law is too violent and absurd, it has been opposed by a large number of people, including Takahashi Kangzhi (Mizuno Masaru), a high school teacher. However, ironically, Takahashi's wife Quan (Takahashi Maliun) was attacked and killed. In the face of the cruel reality, the angry and desperate Takahashi decided to use the law of revenge to avenge his wife.
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