So what the heck was Square saying when he was reciting that poem? Well phonetically, it sounded like this:
kabuzora ya
semi no shoubai
ashi no ura
As for what he ACTUALLY said, well you're just going to have to look it up ;). The online translators don't seem to help, so you might have to find a friend who speaks Japanese. In fact, there are a bunch of fun things to translate in this comic :)
Research... YUM!