Kazuya Minekura

When their latest assailants turn out to be humans, the group is left dumbfounded. The mystery only deepens when they encounter a wandering priest, Hazel Grouse, and his imposing bodyguard.

At last, the Sanzou Party has arrived in India. In this foreign land, where the anomaly's influence runs rampant, their battles only heighten in their violence. And also awaiting them is their tragic fate from 500 years ago-- What will they find at the end of their long and treacherous journey? (myanimelist)

In their former lives, 500 years before Genjyo Sanzo and his crew of misfits began their journey west, they were gods, but being godly didn't make them act any more divine. When Goku flies into a murderous rage after seeing his best friend die, Heaven's had enough and wants him dead! But Konzen Douji, Field Marshal Tenpou, and General Kenren are willing to do anything to protect Goku, even if it means turning all of Heaven against them.

Taking place in the past it offers a view at the Saiyuuki quartet before their formation and their journey to the west. First OVA starts with Sanzo and his master, also with Ukoku (known as a later Ni Jianyi). Second OVA shows first meeting of Goku and Sanzo. Third OVA considers the events after Hakkai's sins and his trial (that we know from first season of "Saiyuuki") and his decision to live in Gojyo's house.

The Sanzo Ikkou continues its westward journey, on a mission to prevent a demonic resurrection. As Genjo Sanzo, Cho Hakkai, Sha Gojyo, and Son Goku fight their way to their goal, their path is fraught with internal strife. When they encounter a formidable pair of adversaries from the west, the cohesion of the group -- and the fate of the mission -- may be at stake. (myanimelist)

Priest Genjo Sanzo and companions Cho Hakkai, Sha Gojyo, and Son Goku maintain their westward journey to stop the resurrection of the demon Gyoumao. As the reputation of the Sanzo Ikkou precedes them, they continue to fight demon assassins at every turn, but they must also deal with increasing tensions within their group in order to defeat a powerful enemy. (imdb)

An evil demon, Gyumao, causing all demons to go crazy. Now, Genjo Sanzo, a trash-taking Buddist monk, is given a mission in India. Now, he is teamed up with three demons, Son Goku, Sha Gojyo, , and Cho Hakkai.