The story begins in feudal Japan with InuYasha, a very awesome hanyō with long silver hair, dog ears and wears a robe woven from the fur of the fire rat (he is half human and half dog demon. When he was a child, humans would often tease and make fun of him for being a halfling. This is one of the reasons why he wanted to steal the Jewel of Four Souls, to use it to become a full-fledged demon), that eventually retrieves a sword called Tetsusaiga, which has extreme amounts of power (The Tetsusaiga can slay 100 demons in one sweep), stealing the Jewel of Four Souls that is a jewel that can increase anyone's powers enormously, from a village. He doesn't get far before Kikyo, Inu Yasha's ex D:, shoots him with a sacred arrow, sealing him forever to the Sacred Tree . Before dying from mortal wounds, Kikyo tells her younger sister, Kaede, to burn the jewel with her remains to keep it from falling into the wrong hands.
What really happened was that orginally in the past, InuYasha wanted to steal the jewel to become a full fledged demon. He kept failing every time. He and Kikyo eventually became a couple, despite their differences, and felt like they could trust each other. However, there is another demon named Naraku who wants the jewel for himself and has a really strange costume. And in an attempt to get it, he tricked InuYasha and Kikyo into thinking that they betrayed each other >:/. In a rage, InuYasha attacks the village to steal the jewel, but he is sealed to a tree by Kikyo's sacred arrow while trying to escape with the jewel.
In modern Tokyo, a junior high-school girl named Aome Higurashi is on her way to school. She stops in the well house of her family Shinto shrine to retrieve her cat, Buyo, and a centipede demon bursts forth and pulls her into the well. Aome miraculously fends off the demon and emerges from the well in the Sengoku period of Japan. She eventually finds InuYasha who is still pinned down to the tree by the arrow, in some sort of eternal sleep.(The tree is enchanted. As long as one is touching it, they do not age. Inuyasha was put under a spell, but on the tree. And remained there for 50 years.) The centipede demon eventually returns and in a panic to be saved, Aome frees InuYasha from the tree, and Inuyasha destroys the demon with his brute strength. When the centipede demon bit into Aome's stomach the Jewel of Four Souls was revealed to be inside of her (how did it get there?).
It also eventually revealed that Aome is Kikyo's reincarnation. This explains why she had the Jewel inside of her and why she was able to free InuYasha (ahh!!! That's why she had it in her stomach....). She also has the power to sense where the Jewel is if hidden, including shards of the Jewel.
With the help of Kikyo's sister, Kaede & Aome place the "Beads of Subjugation" (InuYasha's necklace) on InuYasha. With the command of "Sit, boy!" from Aome, InuYasha is rendered powerless, thus helping Aome keep InuYasha from the Sacred Jewel.
Determined to return home but yet also given the task to protect the Jewel, Aome protects the whole Jewel from InuYasha without fail. Unfortunately, a crow demon found its way to the jewel and ate it, gaining supernatural powers. In pursuit to retrieve it, the demon crow loses a foot. Aome ties the foot to an arrow (since the crow's body parts try to return to the main body each time it is severed) and shoots it at the demon crow. The tip of the arrow shatters the Jewel and the flying shards scatter all over Japan (isn't it kinda exaggerated?).
Aome and InuYasha set out to collect the shards of the Jewel of Four Souls and restore it. Along the way they befriend Shippo, a fox demon, Miroku, a monk who would kick everyone's ass if it wasn't because of those annoying giant bees, and Sango, a demon-slayer. The group often encounter InuYasha's brother Sesshomaru, Naraku (who tricked Kikyo and Inu Yasha into turning against each other), and Koga, a wolf demon who's in love with Aome.
-InuYasha -Aome Higurashi - Kikyo - Shippo - Miroku :D - Sango - Sesshomaru - Naraku - Koga
Higurashi Kagome is called "Aome" in Spanish, because the name Kagome sounds like an offensive pun in Spanish. Especially Latin Spanish. Kagome sounds like Cago-me, where "cago" means shit (example: "Me cago en vos" literally means: "I shit on you" (at least in the Honduras's Spanish)).