After losing a bet and burdened with massive debt, a man is presented with a life plan by an entity known as Tsukikuiyum○. Lamenting how dull his past bets have been, Tsukikuiyum○ proposes to him what may be the worst gamble in history. The terms involve extreme physical acts pushing the body to its limits—testicle kicks, knee strikes to the groin, ball slaps, tying the balls and shaft in a butterfly knot, and crushing the testicles. Throughout this ordeal, the man confronts his own limits and gradually discovers a new version of himself.