Yatsuo Inoo attends Oshaka Academy in Kamakuland, a school reserved solely for descendants of Priest Sanzo's clan. He is a member of the Tatemae Trio, a group claiming descent from Sanzo's lineage that consistently fails to gain admission despite repeated attempts. Alongside Houko Sanzo and Shago Jo, Inoo actively disrupts the protagonists' mission to recover scattered copper plates meant to honor the Oshaka School. The trio's actions are driven by their conviction that their lineage grants them an inherent right to the school's prestige. Inoo is specifically identified as a descendant of Chou Hakkai from the *Journey to the West* narrative. His role centers on providing comedic antagonism through the trio's schemes to thwart the copper plate retrieval.