Kagome Higurashi is an ordinary girl who is somehow pulled into an old well at her family's Shinto shrine by a mysterious force, sending her back in time 500 years to the feudal era. During the time slip, a youkai claims that Kagome possesses the Jewel of Four Souls and attempts to seize it. The girl fights back and when she climbs out, she finds herself in the Warring States Period of Japan, where both humans and youkai reside.

She is quickly recognized as the reincarnation of the shrine maiden (priestess) by Kaede, an elderly shrine maiden who happens to be Kikyo's younger sister. youkai are immediately drawn to Kagome and she flees into the forest to save the villagers who have taken her in. Her presence causes a strange boy pinned to a sacred tree by an arrow to awake. He is Inuyasha, a hanyou and recognizes Kagome as Kikyo, the shrine maiden who sealed him to the tree. In order to combat the youkai, despite Kaede's warnings, Kagome frees Inuyasha from the Genboku god-tree.

However, the youkai manages to attack Kagome and remove an object from Kagome's body, the Shikon no Tama. While the youkai is easily destroyed, it is Kagome's duty to protect the jewel from both yôkai and corrupt humans who seek to use it to gain power - including Inuyasha, who desires to use the jewel in order to become a youkai.

However, when the jewel is shattered, Kagome and Inuyasha must team up to recover the shards before they get into the wrong hands. While they gain valuable allies along the way with the monk (Hôshi) Miroku, yôkai exterminator (taijiya) Sango, and kitsune Shippo, they find adversaries in Inuyasha's older brother Sesshomaru, a resurrected Kikyo, and the malicious Naraku.

(Taken from Wikipedia )