The Cabinet Office decides the participating countries, and recruits the participating youth from overseas in collaboration with the Japanese Embassies and the Ministry in charge of Youth Affairs in respective countries.

To find out more, please contact the Japanese Embassy in your country.
http://www.mofa.go.jp/about/emb_cons/mofaserv.html

Information about how to apply may be obtained from the SWYAA in your country as well.