 Complete the following phrase:  Having reached a plateau in her middle distance career, she changed her focus to running over longer distances from 2011 onwards. She had a best of 71:13 minutes on her half marathon debut at the Marugame Half Marathon and set a 5000 metres best of 15:31.78 minutes on the track to take second at the Japanese Corporate Championships. Her transition to long-distance proved successful in the 2012 season. She significantly improved her 10,000 metres personal best to 31:28.71 minutes in her win at the Japanese Championships, beating the more favoured Kayoko Fukushi and gaining selection for Japan at the 2012 Summer Olympics. Here, she finished sixteenth in the 10,000 metres race, but was knocked out in the heats of the 