The story of Sanzo and his three companions in their quest to the west, to stop the resurrection of Gyuumao. On the way they are fighting youkai, getting into trouble and helping the townspeople.

A place called Paradise. It is the origin of civilization and faith. It is a peaceful garden where humans and monstrous creatures have coexisted in peaceful harmony throughout all time. Suddenly, the monsters become violent and begin to attack the humans.

This vicious change is the result of an experiment to revive the great monster, Gyumao (Bull Satan). Bull Satan has been confined for five hundred years. By mixing science and sorcery, someone started the forbidden experiment that brings this monster back to this world. Bull Satan's revival is imminent. His negative power begins to spread throughout Paradise. The monsters and beasts become wild and the entire world suffers pending disaster.

The resurrection of Gyumao/Bull Satan must be stopped. An apostle of the Celestial Heavens, Sanzo, is summoned to take on the mission of restoring peace and order in Paradise. Sanzo recruits his old comrades, Son Goku, Sha Gojyo Jo and Cho Hackai. The foursome has shared much joy and sorrow and together they have faced many challenging missions. Thus, the outrageous young warriors set out for a journey toward "Indara", a country in the distant west where Bull Satan is close to re-awakening.

It will be a journey filled with danger and difficulties. Hideous monsters and evil sorcerers await our heroes in the narrow trek of jagged mountains, behind the sand of barren lands and in the misty and eerie swamps. In order to save Paradise from destruction, they have to emerge victoriously through all obstacles and ultimately prevent the revival of Bull Satan.

[Source: ENOKI FILMS CO., LTD.]

The gang is traveling along when they find a girl in need. Of course, they all can't resist going after her. This girl isn't all that she seems... her motive or her "humanity".... and soon the whole gang has Sanzo's past on their hands and one certain young boy who can keep a grudge for decades...

[Source: Anime News Network]

A mysterious light falls from the Heavens. It's the Pearl Jade. It can grant any wish. Dr. Ni tells Gyokumen Koushu about it. Lirin overhears and tells Kougaiji. Then Kanzeon Bosatsu (The Merciful Goddess) requests "orders" Sanzo and company to go and find and seal it before it falls into the wrong hands.

[Source: Anime News Network]

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.

[Source: Crunchyroll]

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.

[Source: Anime News Network]

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.

OVA adaptation of the climactic part of Saiyuuki Gaiden.

[Source: MyAnimeList]

Based on chapters 11-13 of the original manga with additional content written by the manga author. The story will be told from Tenpou's point of view.

[Source: MyAnimeList]

At last, they’ve reached the end of their long and treacherous journey! The Sanzo party finally arrives in India, a land where the anomaly’s influence runs rampant. The battles that lie ahead promise more bloodshed and danger, but Sanzo, Goku, Gojyo and Hakkai must rise to save the world and stop the resurrection of the Ox Demon King, Gyumaoh—no matter the cost!

[Source: Funimation]

Once, the land of Togenkyo was a peaceful land, where humans and yokai lived together. Then, however, men appeared who tried to revive Gyumaoh, the Great Yokai who was slain by the war god Nataku Taishi and buried in Houtou Castle 500 years ago, by using a forbidden combination of chemistry and magic

The negative energy waves this created spread across Togenkyo, causing the yokai to go insane and attack humanity. To save the land, Kanzeon bosatsu orders Son Goku, Genjyo Sazno, Sha Gojyo, and Cho Hakkai to go west. The four set out on a journey to stop the experiment to revive Gyumaoh.

On the way, they meet Hazel Grouse, who employs strange magic that uses yokai souls to revive the dead, and his follower Gato. The two of them join the party. And Ukoku Sanzo, a man they have a long history with, approaches in the shadows...

Unforgettable characters, intense personal drama, and awesome action in a story about the bonds between four men!

[Source: Hakuhodo DY Music & Pictures]