Kasey Yukimura is the sister of Kira Yukimura, both sisters struggle to settle down and adapt to their new settings, Beacon Hills. They've heard many stories about the supernatural running around in Beacon Hills, not really sure if they will be involved in the mishaps that occur in the beacon. The sisters later on meets Scott McCall and his group of friends aka his pack. The two sisters are determined to help the pack throughout everything they've been through, the heartbreak, the Benefactor. Kasey then realizes the meaning behind what her father always told her, "You have a tainted heart, and someone will learn to accept it and embrace you with everything they have in them."