Hosaka joined World Championship Wrestling in 1996 and competed in their newly formed women's division. She wrestled in the tournament to crown the first WCW Women's Champion, but was eliminated by Zero. During her tenure in WCW, she was managed by Sonny Onoo and frequently wrestled on "WCW Monday Nitro" and "WCW Saturday Night" against Madusa, Leilani Kai and WCW Women's Champion Akira Hokuto. In 1997, she competed in the WCW Women's Cruiserweight Championship tournament and was defeated in the finals by Toshie Uematsu. During March 1997, Malia Hosaka wrestled Madusa Miceli. During this memorable match, Madusa became extremely brutal with Malia. She grabbed her by the hair. Then she tossed her around the ring by the hair.