Tiger Mask was from Tiger's Cave that was secret organization, and once he'd been the villain wrestler called the "yellow devil." But, because he betrayed Tiger's Cave, Tiger kept fighting against the rough assassin who had life aimed at by Tiger's Cave and who attacked it one after another. Then, a variety of the hot fight with the wrestler left in the impression is unfolded with being an enemy. Source: http://www.animenewsnetwork.com