Mai's master is attacked by Gail, who steals the secret martial arts manual. Filled with rage and a desire for revenge, Mai resolves to enter the COW tournament hosted by Gail. After advancing past the preliminaries, Mai faces Big Thunder, a man of immense strength. She exploits a brief opening to claim victory. However, in the next match, Barry Keith sees through her agile movements and defeats her. Subjected to humiliating vibrator torture at Keith's hands, Mai's body trembles helplessly. In the second round, she desperately pushes her dwindling stamina to achieve another hard-fought win. After winning the tournament, Mai is invited to Gail's mansion. Determined to avenge her master, she prepares to fight—but completely exhausted, she loses the strength to resist. Gail overwhelms her and subjects her to brutal, degrading humiliation.