I think it's pretty straightforward that this story is a parody of all the magical girl shows out there, cause let's face it: there are a *lot* of magical girls out there.
From the get-go, it's a pretty big parody without any real seriousness, but it's pretty damn funny to watch. The first 5 minutes in, I was thinking, "Girls are all gung-ho and/or dramatic, and this is how the guys react."
I almost feel bad for Wombat, seeing as he got stuck with them instead of a group of girls who would help more willingly. :)