Okay I already have the story written. But it is 37 pages so it's gonna take me more than a few days to post. But before I start the actual story I'll explain the world and characters of Saiyuki.
Shangri'La is the world's name. It has the Heavens and the physical world. Humans and demons used to coexist peacefully. But when experiments began to revive Gyumon, a demon who ate humans for fun and was defeated by the war prince 500 years ago, began, the minus wave made all the demons go berserk and give themselves over to their inner demon. Up until this point humans and demons were considered the same. To combat this four people were set out. Gyumon and the others from the anime (enemy wise) won't have anything to do with my story. Here are the characters that I will include from the anime.
Goku- Thinks he's a demon but is actually neither human nor demon. He was born from a rock. Whenever he takes off his youyoku limiter (which makes demons appear human and stops them from berserking in some cases) he berserks and is much stronger, faster, and much more deadly. Goku may look young and think he's young but he's actually somewhere around 500 years old I believe. To Goku he has been held captive in that mountain his whole life just for being a demon but he was actually imprisoned by the Gods for a reason. His spiritual weapon is a red staff with gold caps. It can extend at Goku's will. (Nyoiboi or something like that. I'll be calling a staff.
Sanzo- A human monk with the title of Sanzo. In the anime he is just Sanzo. He's impatient and easily irritated. He's the one who found Goku chained up in a mountain with no memories of his past. Sanzo is famous for his smoking and hitting Goku over the head with a paper fan and/or a rolled up newspaper. Sanzo uses an exorcism gun.
Goyjo- A half-demon. All half demons have red hair and eyes. (human/demon relationships are taboo) He flirts a lot and likes a good drink and/or cigarette along with a good woman. Goyjo's weapon is a metal staff with a crescent moon on the end. The moon is attached to a chain and the chain can come out at Goyjo's will.
Hakkai- Once he was a human and now he's a demon. He bathed in the blood of a thousand demons (who he killed when he lost control of his emotions). Those demons had raped and caused his lover to kill herself because they raped her. She became pregnant and to stop that child from being born she slit her throat. He's the kind and loving (he's changed obviously) and the smart one of the party. His white mini dragon Hakuryu can transform into a jeep.
Goddess of Mercy- only come in once but it's only fair to mention her. She can heal (when she wants to), is very spiteful, and stuck up. Sanzo always calls her a hag and excuse the language here but a bitch. No one understands how she got to be the goddess of mercy when she is so merciless at times.
Now those are the characters. If you'll excuse me I'll sign off for now. If I type/write anymore I'll lose feeling in my fingers. I wrote almost half of those 37 pages tonight.