"Tiger Mask Fuku Men League Sen" is a wrestling-themed anime that centers around Naoto Date, a professional wrestler who adopts the persona of Tiger Mask to combat corruption and injustice in the wrestling world. The series is set in a universe where professional wrestling is a highly competitive and often morally ambiguous sport, with wrestlers forming alliances and rivalries that extend beyond the ring. Naoto, as Tiger Mask, becomes a symbol of hope and integrity, fighting against the malevolent forces that seek to exploit the sport for personal gain.

The narrative unfolds as Naoto joins the Fuku Men League, a prestigious wrestling organization that serves as the primary battleground for the series' conflicts. The league is dominated by the Tiger's Den, a shadowy group of wrestlers who use underhanded tactics and violence to maintain their dominance. Naoto's mission is to dismantle the Tiger's Den and restore honor to the wrestling world. Along the way, he encounters a diverse cast of characters, including fellow wrestlers, managers, and promoters, each with their own motivations and allegiances.

Key characters include Mister X, the enigmatic leader of the Tiger's Den, who serves as Naoto's primary antagonist. Mister X is a cunning and ruthless figure who will stop at nothing to maintain his control over the league. Another significant character is Ruriko Higashi, a journalist who becomes an ally to Naoto, providing him with crucial information and support in his fight against the Tiger's Den. The series also features a roster of rival wrestlers, each with unique wrestling styles and personalities, who challenge Naoto in the ring and contribute to the ongoing narrative.

The plot is driven by a series of wrestling matches, each serving as a battleground for the larger conflict between Naoto and the Tiger's Den. These matches are not merely physical contests but also symbolic struggles between good and evil, with Naoto's victories often serving to undermine the Tiger's Den's influence. The series explores themes of perseverance, justice, and the importance of maintaining one's principles in the face of adversity.

As the story progresses, Naoto's battles become increasingly intense, culminating in a final showdown with Mister X and the Tiger's Den. The resolution of the series sees Naoto achieving his goal of dismantling the corrupt organization, but not without significant personal cost. The narrative concludes with a sense of closure, as Naoto's actions have a lasting impact on the wrestling world, inspiring others to follow in his footsteps and uphold the values he fought for.