Kurama before the seal and the omitted sin

After the sage of six paths died, the tailed beasts lived their own lives before they were forcibly sealed against their will. Kurama as like the other tailed beasts walked on the same land as humans. But because of their power they weren't excepted by humans. Even when they transformed into their human form. Kurama had a strong dislike for humans because of their greed for power and money. Although humans didnt except the taild beasts they would always quest for their power. And for that he looked down on them. Kurama soon learns that there are more to humans than greed, from a women who is part of a special clan. A clan that actually excepts them letting them live amongst them. A clan that ends in sin.

Be consumed by your emotions, that's part of life.