Are the music videos for "Na Na Na" and "Sing" by My Chemical Romance a storyline?

I'm pretty sure that the MV for Sing is a continuation of Na Na Na. Is Na Na Na a continuation of something else? Or, in other words, are there any MCR music videos that go before Na Na Na that create a bigger storyline and/or make it make more sense? Sorry it's kind of confusing, but it's really hard to explain.