Toua Tokuchi, a master of gambling and mind games, holds the remarkable record of 499 wins and zero losses in "One Outs," a simplified form of baseball that consists of only a batter and a pitcher. Visiting Okinawa, Tokuchi's hometown, is Hiromichi Kojima, the star batter of the Saikyou Saitama Lycaons, the weakest team in the Japanese baseball league. Dreaming of leading the Lycaons to winning the championship, and in dire need of a replacement for their injured pitcher during a training camp, Kojima involves himself in a game of One Outs, only to lose to a normal fastball from the seemingly invincible Tokuchi.

Mesmerized by his prowess, Kojima recruits Tokuchi to the team after narrowly avoiding defeat in a rematch, believing he might just be their key to victory. However, the greedy owner of the Lycaons refuses to give him a decent salary, leading Tokuchi to suggest an unusual contract: every out he pitches will gain him five million yen, but every run he gives up will lose him fifty million yen. With his fate now tied to that of the team, Tokuchi's fight to bring the Lycaons to victory becomes yet another gamble—the very thing that he does best.