Please see the following website for details regarding the eligibility requirements for Winter AO 2020 (Global).
Winter AO 2020 (Global) [Admissions for the GIGA Program]
As per the news released on April 17, 2019, the application process and basic requirements for applicants who graduated from high schools outside Japan or international schools in Japan will remain unchanged for AO Global / Admissions for Overseas Students (GIGA Program). Applications will also now be accepted from students from high schools in Japan who meet the requirements.