Okay I can honestly say it's been a long while since I read the story but here's what I remember: Kagome travels further back in time, so far in fact that instead of landing in a well she lands in a river. She saves a kidnapped child Sesshoumaru from human bandits and takes him home. She helps out in the time before entering an enchanted sleep that turns her into a demon. When she wakes up she leads the demon population (the ones that will follow her anyways) through the "holy wars" and trade with other countries allowing demons to exist in the modern world. Any information would be appreciated cause I have been yearning to read this for literally months!