Fist of the North Star manga volume 6 features story by Buronson and art by Tetsuo Hara.

Freed from his captivity in Cassandra, Toki reveals the secret of the prison to Kenshiro. The City of Wailing Demons was established by Raoh in order to gather and confine martial artists to steal their secrets. But Raoh is not just another wasteland warlord - he is none other than Kenoh, brother of Kenshiro and Toki, who once contended for the title of successor to Hokuto Shinken! It’s not long before Toki and Kenoh cross paths again and continue a deadly struggle that started long ago...