Akemi is a dragon tattooed leader of the Tachibana Yakuza clan. In a duel with a rival gang Akemi slashes the eyes of an opponent and a black cat appears, to lap the blood from the gushing wound. The cat along with the eye-victim go on to pursue Akemi’s gang in revenge, leaving a trail of dead Yakuza girls, their dragon tattoos skinned from their bodies.
A young reporter, Kotaro Rai, is on the trail of a ring of gem thieves. But Rai is faced with an evil that threatens all of Asia, the Zensei Majin who had been in disguise. Luckily, the man's life is saved by a good spirit named Diamond Eye, who had appeared from one of the stolen diamond rings. From that day on the diamond hero entrusted the ring in Rai, and when he's in need of help, Diamond Eye would appear and protect him.
Emerging from a stint in prison, yakuza lieutenant Sumukawa discovers that his gang has disintegrated. An ambitious type, he quickly hooks up with another gang who promise him a prominent position if he helps them deal with a rival family. But bonds are made to be broken, and pledges of loyalty soon give way to competition, betrayal and — naturally — retaliation.
