I think OTOO doesn't know what they are talking about. I have been to Tokyo YMCA International School many times and found the teachers and staff helpful, student targeted and producing some very informed and inquired thinkers in their student body. The bad review must be from a disgruntled employee or something but I encourage people to take a look and view for yourself.
I had my child there for a while. Very bad experience. Teachers hate it there. And they leave or get fired for saying things to the bosses. The bosses are not educators. It is a joke school. Many teachers there are great and they try very hard, but the administration is so bad they are fighting against the teachers. If you want to know about the school for real, ask the teachers. Find them private on the side and they will tell you the truth about that school. Does the principal have a degree in Education? No. Crazy.