Set in the past, this series delves into the backstory of the Saiyuki quartet before they band together for their legendary journey to the west. The initial OVA introduces Sanzo, his mentor, and Ukoku (later known as Ni Jianyi). In the second OVA, viewers witness the fateful meeting between Goku and Sanzo. The third installment explores the aftermath of Hakkai's transgressions and subsequent trial, as depicted in the first season of 'Saiyuki,' ultimately leading to his choice to reside in Gojyo's residence.