 Complete the following phrase:  After graduating from high school she turned professional and signed a contract with Nike Japan. In the 1983 season she won her first 400 m title at the Japan Championships, but relinquished her 200 m title to Emiko Konishi. She regained her 200 m title in 1984 and was not defeated nationally in the event for another four years. Her win streak of five only came to an end in 1989 when Toshie Kitada took the crown. She was a prominent pick for the 