Because of his great trust in his best friend, Raizel, Kira was put in this predicament. He was now stuck in his casket, trapped in that underground basement of the Zhou Ancestral Mansion.
No one knew that he would be there. And Raizel succeeded in sealing him, putting him to sleep. Unless someone would go there to break the sealing spell, Kira would be freed.
Unfortunately, no one knew that he would be there. The only vampire whom he had contact with was Serafino. And he gave him the task to find Gisel, Selene's best friend.
Kira knew that Gisel was also against this war. He would seek her help to stop it. She was also a powerful werewolf. Serafino was now busy tracking her once more. So without Serafino, no one would know that Kira was missing and that he needed help.