Taking place in the past it offers a view at the Saiyuki 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 "Saiyuki") and his decision to live in Gojyo's house.

An OVA adaptation of the climactic part of Saiyuki Gaiden.

Many 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.
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(Source: Anime News Network)

The fearsome foursome continue their journey west towards Shangri-La, encountering new challenges and new adventures along the way. Their legend precedes them, but not always in the way one might expect. The Minus Wave that apparently drove all the youkai in the land mad looks like it might have missed one, as Sanzo, Gojyo, Hakkai and Goku meet a lone guardian and the band of children he cares for. Fear and misunderstanding run throughout this particular leg of the journey, including between the members of the Sanzo group! 
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(Source: Tokyopop)

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