Please check to see if your country is listed for Exemption of Visa (Short-Term Stay):
http://www.mofa.go.jp/j_info/visit/visa/short/novisa.html
If your country is not listed, please contact ioi2018@jtbcom.co.jp, for assistance with visa application procedures.
For complete Visa Information, please visit:
Ministry of Foreign Affairs of Japan – http://www.mofa.go.jp/j_info/visit/visa/index.html