There once was a demon who was in love with a human, but everyone despised that they were in love. The demon's name was Inutaishou, and the human's name was Izayoi. So, they spent a while together, and he kept going back to see her, and eventually, she got pregnant with Inuyasha. The night she was supposed to have him, her village was attacked.
When Inutaishou got there, he found that she was badly hurt. He took her with him, and went to his house. When they got there, she had Inuyasha, but died about three days later. So, Inutaishou called his oldest son, Sesshomaru to come home for a while so he could care for Inuyasha while Inutaishou went to go get food.
When Inutaishou got him, he found that his house had been attacked by passing villagers, but thank god, Sesshomaru had hidden Inuyasha in a closet so he wouldn't get hurt. Sesshomaru had chased all the villagers away so they wouldn't destroy anymore.
When Inuyasha was ten years old, he ran away from home to get away, but Sesshomaru had gone to bring him back so that the villagers wouldn't hurt him.
One day, after Inuyasha had gone to training, he had found a big demon that he had thought would bring him home. Instead, the demon had sent Inuyasha to the demon camp where they used demons to do people's work.
Inuyasha spent about fourteen years there. After that, he was sent to a village to work for them. Once there, he fell in love with a Priestess named Kikyo, but he and Kikyo were forbidden to see each other due to the fact that she had magical powers and if she fell in love with a demon, they would disappear. But even though they were forbidden to see each other, they still would meet secretly. They would spend the whole time with each other as long as they could.
When they had been together for about a year, Kikyo got pregnant. When the villagers found out, they locked Kikyo in a dungeon cell, and forced her to stay away from Inuyasha.
When Kikyo gave birth to her daughter, she was allowed out of her cell only to eat before she was put back in.
After about a year of being locked in there, she was allowed to see Inuyasha, but only when they were being watched.
Another year passed, and Inuyasha was allowed to see their daughter, only to find out that Kikyo had yet to name her. When he asked her why, she told him that she was waiting to name her while Inuyasha was there so they could name their daughter together.
After a while, they decided on the name Kikya, but when they were going to get together again, Kikyo was attacked by a demon that looked like Inuyasha, but on the other side of the forest, Inuyasha was being attacked by a person who looked like Kikyo. As soon as he takes a closer look, he sees that this Kikyo wasn't carrying Kikya. He ran to find out where exactly Kikyo was and if they were okay. When he got to the edge of town, Kikyo shoots him in the back with her enchanted arrow. He was put under a sleeping spell, but Kikyo was so hurt from the other Inuyasha that she had to leave, and Kaede was forced to take of Kikyo and Inuyasha's daughter.
A few years later, Kikya was stolen by the same demon that had taken Inuyasha. When she was sent to the camp, she got worked so hard that she fainted, and blacked out so bad that she forgot where she was. After that, she got sent to a house, were she worked for the family until she got old enough that they let her go. Once the soldiers found out, they came to kill the family because it was against the law to let a demon go that had been working for you. They were killed, and when she came back from the village, she found out that they had been slaughtered. In her rage, she sought to kill the village that killed her kind family that had taken her in. In doing so, she released the evil inside her. When she found the village, she went inside, and just before she killed them all, she went to a forest, where she found a human woman. As she talked to the woman, she found out that she actually had a lot in common with the woman. She went with the woman to her village. When she got there, she went to speak to the Priestess of the town. She found out that the Priestess was her aunt, and her name was Kikya. She asked the Priestess what her mom was like, and found out that there was a demon who lived there that was her father, but the only one that knew the truth was the Priestess Kaede.