Long time no see, indeed.
I'm not sure. If by "takes" you're refering to how many different tracks he recorded in his songs, then from what I've read from the Youtube comments spanning several of his videos, he does all the backing tracks himself in Sonar 5 or something, so it could be several takes (Bass, backup guitar, overdubs, drums, etc.). The video itself looks continuous (minus the obvoius screen transitions, but theoretically they could have forced a single take into different concrete sections and added in those transitions), but then again, I'm an audio guy, not a video guy.
Ultimately, I can't know for sure because his site,
http://www.kurikinton-fox.com/, is written in Japanese. Seeing as how some of the people here know japanese, perhaps they can go to the site and shed some light on the situation?
Oh, and BTW:
http://www.youtube.com/watch?v=jVh0Ep8fDIs&mode=related&search= FF7 Boss Theme cover, in case ya missed it on the "related movies" section.