Though she agrees with Kiba's ideals of protecting humans, Yuka occasionally kills humans who seem bad such as bullies on reflex without others knowing. This habit would eventually gain interest by Lucky Clover because despite being a renegade, she kills humans. It's implied that Yuji and Naoya were unaware of her actions. She swapped e-mails with Keitarou to a lesser extent after becoming an Orphnoch, as she later developed a strong crush on Kaido, though he did not reciprocate. Eventually she and Keitarou came to realize who the other was, and they had a brief relationship before she was weakened by police's shots and killed by Saeko in Episode 44 when Osada was unable to assume Orphnoch form.
In the Paradise Lost ending, Yuka was impaled by the Elasmotherium Orphnoch. The design for Crane Orphnoch in Paradise Lost is different, her face is different, her winged collars are extended, protruding upward in a flying pose and crane-like legs.