Understanding the US-Japan Pension Agreement

Hello,

I have been researching the US Japan pension agreement but don't completely understand how it works.

I've been in Japan for over 10 years so I understand I'll get the Japanese pension.

Before that I worked in the US for 2 years, not enough to qualify for Social Security but because of the agreement how does this all work? What would happen if I move back to the US?

by Huge-Acanthisitta403