hoshi no tama or star ball is something that kitsune need, because half the power of a kitsune is inside it. Now you go back to 12th century in Japan, You wake up in a forest whose territory isn't far from residential areas. When you wake up, you found a star ball and you take it, it's Akemi's star ball. Akemi is 9 tail fox, he has the biggest power than the others. "give my star ball back, i'll protect you in any danger, if you don't we'll become enemies."