 Complete the following phrase:   is a Japanese track and field sprinter and hurdler, who specializes in the 400 metres sprint and 400 metres hurdles. She competed for her country as part of the Japanese womens 4 × 400 metres relay team at the Summer Olympics in 2008 and the World Championships in Athletics three times 2007, 2009, 2015. She has been a four-time medallist in the relay at the Asian Athletics Championships 2007, 2011, 2013, 2017, including a gold medal in 2011. She won her first major international medal in the hurdles  a bronze  at the 