Daughter of a Chinese woman, who spent her childhood in Nishi Ku, a district in Fukuoka City, Japan. Her early life was marked by her parents' divorce, after which she moved in with her mother, who ran a small restaurant. Growing up, she developed a passion for karate, practicing it in junior high school and eventually representing Kyushu in several competitions. Her impressive skills led her to win the women's national karate championship.
As she entered Nippon College of Health and Physical Education for women, she studied physical education, but it was during this time that she discovered her love for action and stunts. Inspired by the film "Young Master" (1980),directed by and starring Sing Lung, she enrolled in the Japan Action Club (JAC) to pursue a career as a stuntwoman. She later changed her name to "Oshima" and made her debut in the TV series "Super Electron Bio-Man" in 1984.
As part of JAC, "Asia Action" became independent and relocated to Hong Kong, prompting Yukari to leave Japan. Her breakthrough in the martial arts film "Shanghai Express" (1986),directed by Chinese director Hung Kam-Bo, marked the beginning of her career in Hong Kong. She went on to appear in over 20 Chinese films until 1994, when she divorced star Cheng Ho-Nam and established herself in the Philippines.
In the Philippines, she changed her name for the second time, this time to "Cynthia Luster" (Sincere Raster),and continued her acting career, participating in over 20 films.
