1x8 - Nabari no Ou

As Miharu searches for Kumohira, he is caught by Yoite and Yukimi. Meanwhile Kumohira attempts to assassinate Frosty, but is stopped when Yoite and Yukimi show up with Miharu. As Frosty and his men try to escape, they are attacked by Yae. What is Yae's true motive for wanting Frosty dead?