Shaman King is both an anime series and a manga series by Hiroyuki Takei. The manga has ended in Japan with 32 volumes.
The Shaman King manga started in Shueisha's Weekly Shonen Jump in Japan, and in the same country it aired on TV Tokyo. In North America, the manga is currently being printed in Viz's Shonen Jump, with edits to a few chapters. The Shaman King anime in 2003 was licensed by 4Kids Entertainment for American television broadcasting and finished its run on 4Kids TV, formerly the Fox Box, in 2005. It's also on YTV in Canada. Shaman King is aired on JETIX (formerly Fox Kids) in the United Kingdom and Brazil(in Brazil it is currently being printed by Editora JBC). Shaman King is printed in simplified chinese in Singapore with the name of 'Tong Ling Tong Zhi' by Chuang Yi  with the total of 32 volumes. Shaman King also play in Ntv7 in Malaysia Television since February 2006.
A shaman is a link between this world and the next, and teams up with ghosts and spirits to achieve their goals. Many a shaman's greatest dream is to become Shaman King, and be able to contact the Great Spirit in order to be the savior of the world. This series is religious in a sense, but not religious at all, in a way that could be only described as how Japanese see the often explosive topic of religion, foreign and otherwise. Various magical and religious terms are spread through out the story but they merge into something explainable by the time the main plot arrives.
The process of the spirit ally merging with the shaman is known as "hyoi gattai" in the Japanese manga and anime, "integration" in the English manga, and "spirit unity" in the English anime.
The series spans 285 manga chapters, and ended with a small short "extra story", known as the Funbari no Uta. Many fans of the series abbreviate its name to "Mankin". The Shaman King trading card game is available in Japan and North America.
Recaps1x12: A New Shaman recap
: Rio’s gang sits by him as he sleeps. Anna has informed them that Rio will probably sleep for another week... read more.1x11: Vendetta recap
: Anna taunts the spirit in Rio to show his face. He complies, introducing himself as the great thief Tokageroh. He will have his revenge after 600 years. Anna replies that Tokageroh is a stupid name. Tokageroh tells her to watch herself and grasps Morty tighter. He says he has come to take revenge on Amidamaru for killing him 600 years ago with The Sword of Light. Anna replies that it’s probably a wooden sword. He again threatens Amidamaru, but Amidamaru doesn’t remember who Tokageroh is or if he killed him - he’s killed many evil men. Anna accuses him of being weak and asks how he can possibly expect to beat Amidamaru’s spirit now. The spirit again requests that Yoh and Amidamaru merge as he threatens Morty. Anna steps in refusing to let Yoh fight. Anna explains that Yoh will one day be the Shaman King and she will then be his wife. Anna refuses to let him be killed by the likes of Tokageroh... read more.1x10: The Infamous Tokageroh recap
: Yoh and Morty arrive back home completely tired. Anna greets the two angrily because they are late. Anna explains that she is hungry and Rio isn’t there to cook. Rio has given up all hope of becoming a Shaman. Fortunately, one of his gang members named Muscle Punch, has a solution to finding the "best place". The best place is Arcadia where people embark on a journey to find their true purpose to life, a place that will accept them. Their new best place is thirty minutes away. The gang's destination - the Funbari Bowling Alley. The place was abandoned a while ago, but Muscle Punch was able to play with the wiring to get it to work again. Rio is unsatisfied with the bowling alley. Muscle Punch asks what’s wrong with it. Rio explains that it’s too far from the train station and there are no shops around. The best place isn’t a playground. It is a place where they can rest their hearts and feel at ease. Muscle Punch understands and they abandon their temporary best place. However, before they go, they play a couple of games of bowling... read more.1x9: Northern Boarder recap
: As Yoh and Morty walk home, they notice a snowman in the middle of the road. They think that’s kind of weird for summer. There is a man lying by a light post not moving. Yoh starts making fun of the guy and going through his stuff. The person awakens and Yoh is thrilled. They take the boy back to their house. After dinner, the boy meets Tamegoro, the family head of the previous owners of the house and is completely startled. Morty is impressed that the boy can also see spirits... read more.1x8: The Rio Deal recap
: Rio and his gang sit at a restaurant. Rio has decided… he will become a Shaman. The next day, Rio asks Yoh to become his master and train him to become a Shaman. Anna tells him okay, so long as he passes the test - cooking. Rio passes and he's actually a pretty good cook. Anna tells Rio that he can start work immediately. Anna gives Rio his training schedule, it appears to be a list of household chores. Rio is satisfied with the list, believing that taking care of the master is a significant part of the training. Rio observes Yoh training, lifting weights and running. Rio accompanies Yoh while he is jogging around town... read more.