Hokuto no Ken Episode 81
Kenshiro thinks about Shuu, another member of the Nanto Roku Seiken, who was the master of Nanto Hakurou Ken (South Star White Heron Fist). He remembers how Shuu fought against Souther, the Holy Emperor, and died placing the last piece of his Holy Cross Mausoleum in place. Kenshiro thinks about how Shuu was destined to be the star of benevolence, and how he would avenge him.
In the manga...
-This episode is filler and does not happen in the manga.