»Saiyuki« Here's the info from the manga: The beautiful Shangri-La, pillar of civilization and religion in the East, has fallen into chaos. An experiment to revive the dreaded youkai Gyumaoh combined science and youkai magic against the laws of nature; the result was the Minus Wave that spread through the land and drove all once-peaceful youkai into a human-eating frenzy. As humans and youkai now fight to the death, Priest Genjyo Sanzo and three youkai with human blood-- Son Goku, Cho Hakkai, and Sha Gojyo-- travel West to India with the intention of halting the experiment and saving the land. If they don't throttle each other first. Saiyuki is another series that is an adaptation of the Chinese "Xi-You-Ji" legend. The most popular one was Dragonball by Akira Toriyama.