From Tekken Zaibatsu Wiki
Asuka participated in The King of Iron Fist Tournament 5 in order to fight Feng Wei; he sent her father to the hospital in a heap. She was unable to find Feng Wei at the tournament, and her life gradually returned to normal.
Sadly, peaceful days were swept away in the wake of global pandemonium. After learning that she is related to Jin Kazama, the leader of the Mishima Zaibatsu and the man behind the chaos, Asuka decided to enter The King of Iron Fist Tournament 6 to bring him to accountability.