In March 1979, Tomori won the annual Japanese boxing series, All-Japan Rookie King Tournament in the junior flyweight division. Although he lost on points to Kazunori Tenryū in the Japanese junior flyweight title bout in November 1979, he knocked out the sixteen-time defending champion Tenryū in the first round of the return match in February 1980 to capture the title. However he lost on points to Shūichi Hozumi in his second defense in August of that year. He competed with Masaharu Inami for the vacated title, but it also ended in a failure. Originally Tomori was an out-fighter who excelled in the speed and skill. During his professional career, he had almost mastered the in-fighting to be spotlighted. However his transformation into an in-fighter was still incomplete. So, his manager Misako made him go to the temple for the
sitting meditation practice in order to discipline his mind. Tomori regained the vacant Japanese title via a close decision in October 1981, and defended it once via a unanimous decision in his first professional fight in his hometown of Naha. On April 13, 1982, Tomori was scheduled to fight against
Amado Ursúa for the WBC junior flyweight title at the Korakuen Hall. He trained under the guidance of
Eddie Townsend who signed a deal with Misako Boxing Gym in March of that year. Nevertheless, he built a lead over Ursúa until the middle of the fight throwing his sharp right
crosses and left jabs. In the later rounds Ursúa fought back fiercely, but was dethroned via a
split decision. Ursúa expressed dissatisfaction to the decision. His first defense against
Hilario Zapata was initially scheduled in
Panama City on June 5, 1982. However it was postponed to July 20 and moved to the Ishikawa Sangyō Hall in
Kanazawa, Ishikawa due to Tomori's
rib injury. In that first defense, Tomori lost to Zapata via a split decision. Misako protested the decision of the judges to the WBC, and Tomori had a rematch with Zapata as a challenger at the
Kuramae Kokugikan on November 30 of the same year. However Tomori who had believed his own victory in the previous fight, told that he would not be able to fight more than he did on July 20. Some time after that fight, Tomori retired. ==Professional boxing record==