Lucy Yajima was a skilled agent for the British Criminal Investigation Agency, but has recently been transferred to Japan's National Security Agency. Her true identity is a female ninja from the Himekawa clan. She has excellent intelligence, a confident personality, and is stubborn and unwavering in her beliefs. Tsujimaru is able to see through her weaknesses, despite her extraordinary talents. She is passionate and has a deep sensitivity to sex, making her the perfect prey. In the end, she surprises Tsujimaru and the others by developing her incredible sexual sensitivity and orgasmic ability.