The ABCs in Japan

When I first had my Japanese students in Elementary school sing the ABCs, I was really confused when what they were singing didn't really synch up with how I was doing it. So on the second go around and stayed quite and listened and this is what I heard. http://www.youtube.com/watch?v=Q8SU5svRIuM

Slightly different from what I'm used to from the US and definitely enough to through me off.