The mysterious organization ``Destroyer'' has declared that it will destroy anachronistic cultural properties and buildings within a year in order to transform Japan into a country worthy of a modern nation. Famous temples and shrines were blown up one after another, proving that those words were true. Ryuji Kawabe, a death row inmate imprisoned in Miyagi Prison, is a former assassin who only targets villains. Immediately after Ryuji is executed, he is protected and revived by the National Secret Security Bureau and reborn as "Z", a secret agent with a license to kill. Their mission was to uncover the true nature of the "Destruction Party" and destroy it.