Qwan

From Tokyopop:
In the era of the Romance of the Three Kingdoms, the fall of the Han Dynasty in Ancient China, a strange boy Qwan and his winged companion Teikou are on a quest. In order to find his purpose and the truth of his existence, Qwan is told that he needs to find the holy text, the Essential Arts of Peace. During his journey, he sucks in the body of demons, apparently as his meals. Will this super-strong demon eater locate the texts and discover his destiny?
Add by fan:
A heaven-sent messiah, unfortunately Qwan lost his memory and purpose. He sucks demons instead of eating food, Qwan is a mysterious power who can interest both humans and non-humans. His companions are winged beast Teikou, long-lived big-breasted human girl Shaga and so many others. They struggle on a world in chaos, with the end of Han dynasty, monster abound. Just what is Qwan’s purpose and how will he achieve it? Let’s read on!