"Patalliro Saiyuki! Gaiden" is a comedic and adventurous manga that reimagines the classic Chinese novel "Journey to the West" within the universe of the "Patalliro!" series. The story centers on Patalliro, a young and flamboyant prince from the fictional country of Malynera, who takes on the role of the monk Xuanzang in this parody. Accompanied by his loyal companions—Bancoran as Sun Wukong, Maraich as Zhu Bajie, and Jiro as Sha Wujing—the group embarks on a journey to retrieve sacred scriptures from the West.

The narrative blends slapstick humor, absurd situations, and satirical elements, staying true to the tone of the original "Patalliro!" series. Patalliro’s exaggerated vanity and eccentric personality often lead to chaotic and humorous encounters, while Bancoran’s stoic and protective nature provides a counterbalance. Maraich, with his gluttonous and lazy tendencies, and Jiro, the more grounded and practical member, round out the group dynamic. Together, they face a series of bizarre and fantastical challenges, including battles with demons, rival factions, and otherworldly beings, all while navigating their own interpersonal quirks and conflicts.

The manga incorporates elements of the original "Journey to the West" but heavily adapts them to fit the comedic and campy style of the "Patalliro!" universe. The characters’ exaggerated traits and the over-the-top scenarios create a lighthearted and entertaining narrative that appeals to fans of both the original series and those familiar with the classic tale. The story maintains a focus on humor and adventure, with occasional moments of camaraderie and growth among the characters as they progress on their journey.