transfer japan pension to canada pension

hi all
i'm new to this forum. i was wondering if anyone knows anything about the japanese pension system? i've been working ft and paying the pension here n japan for about 5 years now. will move back in spring. i know that canada and japan have some sort of pension agreement where you can essentially transfer it from one country to the other, but i don't know how to go about it. any help?
thanks very much.