Third track is the full version of the theme song used in SOS-dan's film. I actually think the short version as used in the film is better, umm, in its badness. It's kind of like having too much pudding. Small amount is great, but you don't want to overdo it. I'm not saying that it's bad, umm, good, umm.... Basically, I'm not complaining about anything.
In case anyone is wondering, short version of "koi no Mikuru densetsu" can be found in the bonus CD of the first-pressing of Episode00 DVD.
Aya-chan songs are good, too, of course.
