Three couples are staying at a lakeside cottage with their children. They want them to prepare intensely for a prestigious high school's entrance exam with the help of a private tutor. One night, one of the wives confesses to her husband that she has killed his mistress.

A brilliant hitman and a veteran former hitman join forces to take revenge on the murdered woman and challenge the criminal organization.

To combat rising crime and terrorist activities in Japan, the Japanese National Police Agency authorizes the formation of a secret motorcycle unit known as the Wild 7. The motley group consists of reformed convicts - ranging from simple thugs to former Yakuza members. The Wild 7 are tasked to take out criminals the police cannot touch - due to the criminal's connections with politicians and wily lawyers.