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The Monster with 21 Faces (かい人21面相, Kaijin Nijūichi Mensō) was a criminal group who terrorized Japan from March 1984 to August 1985 . They committed Attempted Murder, Kidnapping for Ransom, Burglary Injury, Non-Residential Building Arson, Attempted Extortion and many Postal Law Violations.

They were never caught .

The information gathered is presented in an 8 episode podcast called “The Monster with 21 Faces”.