After defeating her sister, Anna, Nina Williams was without an immediate goal to attain. Jin Kazama, recently appointed the leader of the Mishima Zaibatsu, recruited her as a member of his special forces. As someone who wasn’t selective about her clients, Nina engaged in covert demolition operations around the world as part of the Tekken Force.

As the conflict between the Mishima Zaibatsu and the G Corporation intensified, the Mishima Zaibatsu announced The King of Iron Fist Tournament 6. Nina decided to enter the Tournament to eliminate anyone who poses a threat to Jin Kazama.

To regain her memory, Nina Williams met with her sister, Anna, for the first time in several years. Upon seeing her sister's face, Nina remembered the bitterness of their past encounters and immediatley went for her gun. The shootout lasted for days, but  neither sibling could make a decisive hit. They decided to settle their fight once and for all at the upcoming King of Iron Fist Tournament 5.