Gaea Japan
Instead of continuing her amateur wrestling career in a university, Nagashima took part in an audition held by professional wrestling promotion, Gaea Japan, which she passed with flying colors. Nagashima eventually made her in-ring debut at Gaea Japan's inaugural event on April 15, 1995, wrestling Toshie Uematsu to a twenty-one-minute draw. On April 29, 1996, Nagashima defeated Sonoko Kato in the finals of a tournament contested between Gaea Japan's rookies. On July 31, Nagashima turned on the Gaea Japan Seikigun ("regular army") and joined forces with Mayumi Ozaki, Carlos Amano and Sugar Sato, forming a stable, which later became known as Oz Academy. As a result, Nagashima began working as a villainous character for the first time in her career. Nagashima also made guest appearances for the All Japan Women's Pro-Wrestling promotion, where she and Sato won the AJW Tag Team Championship, Nagashima's first title in professional wrestling, on September 1, 1996. From 1998 to 2001, Nagashima and Sato also won Gaea Japan's tag team championship, the AAAW Tag Team Championship, three times. In May 2000, Nagashima and Sato ended their longtime partnership with Mayumi Ozaki by quitting her Himiko stable, the most recent incarnation of Oz Academy, and returning to Gaea Japan Seikigun. On June 2, 2002, Nagashima first won a tournament during an afternoon show to become the number one contender to Gaea Japan's top title, the AAAW Single Championship, and later that same day, during an evening show, defeated Meiko Satomura to become the new champion, while also becoming the lightest champion in the title's history. She lost the title to Manami Toyota on October 20. During the next two years, Nagashima went on to win the AAAW Tag Team Championship two more times, once with Meiko Satomura and once with old partner Sugar Sato. Nagashima's five tag team title reigns are a Gaea Japan record. On April 10, 2005, Gaea Japan held its final event before going out of business, during which Nagashima and Sato defeated Ran Yu-Yu and Toshie Uematsu, the final AAAW Tag Team Champions, in a non-title match.