Qwan

Qwan (怪·力·乱·神 クワン, Kai·Riki·Ran·Shin Kuwan, lit. "Confused Spirit With Mysterious Powers Kuwan") is a seinen manga series by Aki Shimizu, published in Japan by Media Factory. It was also published in the United States by Tokyopop, in France by Soleil Productions, in Hong Kong by Jade Dynasty and in Taiwan by TongLi Comics.

Plot
Qwan, a strange boy who can eat demons, travels through Eastern Han Dynasty China with his winged companion Teikou, looking for the sutra known as the Essential Arts of Peace which he knows for certain will reveal who he is and what his purpose in life is. But there are other people interested in the sutra, like Yuushi, who will ambush him and try to stop him.