The Yamaguchi-gumi’s “gangster apartment” is a guesthouse building in Kabukicho, Shinjuku. After the boss of the gangster group Ansheng, Yoshio Ansheng, and his mistress and 100 million yen in cash disappeared, gangsters were killed every day in the gangster apartment. The outside world concluded that this was done by the legendary killer “Ichi”. The leader of the fighting faction, Kakihara (played by Tadanobu Asano), began to frantically search for the murderer. Kakihara is an extreme masochist who regards the sadistic boss as his own god, obsessed with and worshiping him. Kakihara mistakenly believed in the retired gangster uncle, kidnapped the leader of the rival gang, tortured him to extract a confession, caused a storm in the gang, and made the Ansheng group at a loss. The boss’ mistress Karen (played by Sun Jiajun) is familiar with the uncle, and takes risks to please Kakihara. With the help of the uncle, Karen gradually approaches the mysterious killer Ayi... The masterpiece of the great director Takashi Miike, the bloody and violent aesthetics are pushed to the extreme.