Yuu, along with his parents, are a part of a traveling caravan who is taken to Lin by Peru after she collapsed in the middle of the desert while wandering in search of Kenshiro. Yuu becomes ill only after rescuing Lin, so she and Peru join Yuu's parents on their trip to Amiba's castle. When Amiba tries to euthanizes Yuu, Kenshiro arrives in time to press a vital point to save him.

(Source: Wikipedia)