She placed fourth at the 2007 Summer Universiade and came twelfth at the 2009 World Championships in Athletics. Otoshi was the silver medallist behind Li Yanfei at the 2009 East Asian Games. In her second global appearance she came 22nd at the 2010 IAAF World Race Walking Cup. She figured in the top twenty at the 2011 World Championships in Athletics, although her 19th-place finish was not improvement on her 2009 performance. She was one place higher at the 2012 IAAF World Race Walking Cup.