Children and families love Osaka YMCA International School! OYIS is the leading private, English-based, preschool to grade 9 international school in the city of Osaka, Japan. Our education is designed around children’s learning needs. Our service is about the happiness of families. Our students come from around the world, and so do our teachers. We have some of the best educators in Japan. We are accredited by the International Baccalaureate Organization (IB) and the US-based Western Association of Schools and Colleges (WASC).