Gensou Maden Saiyuuki
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Official SiteMany years ago, humans and demons lived in harmony. But that unity ended when demons started attacking humans and plotted a mission to unleash Gyumao - an evil demon imprisoned for thousands of years. Now, Genjo Sanzo, a rogue priest, must team up with three demons - Sha Gojyo, Son Goku, and Cho Hakkai - and embark on a perilous journey to the west to stop these demons from resurrecting Gyumao and restore the balance between humans and demons on Earth.
(Source: Anime News Network)