The Tale of The Miko and The Hanyou
In 1512, Feudal Japan there was a story about a miko named Kagome and a hanyou named Inuyasha. Inuyasha was sealed to a tree in 1462 by the miko Kikyo. The legend says that Kagome came through a well called "The Bone Eaters Well". Kagome was supposedly the reincarnation of Kikyo. The jewel came out of Kagome.
The Shikon no Tama, The Jewel of Four Souls was broken into hundreds of shards. They looked for the shards for a year. During that time they met a monk, a demon slayer, and a kitsune. They fought many fierce demons.
In the last fight Inuyasha used his large sword, The Tetsusaiga to kill the fierce hanyou, named Naraku; who had tried to kill them many times. Then Inuyasha turned into a youkai and in order to protect the miko, defeated Naraku with one blow.
The miko got frightened of the youkai and he tried to calm her but she hurt him and he turned on her. He tried to kill her but she used the jewel to restore herself and him by turning themselves into inu-youkais. She was unharmed after this and he returned to his normal self, regretting what he had done, he tried to kill himself. Kagome stopped him. She told him what she had wished for and he stopped. In the end they had four children. They were hunted down, along with all the rest of the demons in the 18th century. No one knows what happened to them to this day.
There are theories. One, is that they died along with many other demons. Two, is that Kagome decided to return to her world and they lived in the different eras. Three is that they lived and are living among us, now. As many other demons are, that we can not find.