 Complete the following phrase:  On 7 March 2008, when Kumagai was 17 years old, she debuted for the Japan national team against Canada. In August, Kumagai was selected for the Japan U-20 national team at the 2008 U-20 World Cup. In 2010, she played for the U-20 team as captain during the 2010 U-20 World Cup. In 2011, she was part of Japans 