It's the age-old question debated from the earliest times by Greek philosophers through to todays modern thinkers - Sometimes the answer is staring you right in the face :(
I suppose in Japan being a school girl is an occupational hazard, you don't know what deranged pervert will leap out at you. You've got Pedobear lurking about as well, so best to get tooled up, and where better place to put your weapon?
What are the chances that Vin Diesel is his real name? I'd say about 0% can you think of anyone called Vin or have the surname of Diesel? Its like when Homer changes his name to Max Power.
If you are a hardcore geek then i guess this rates as the ultimate nerdore pr0n - For everyone else it's just another cartoon that we will never truly understand - WTF?
This is in Winchelsea, East Sussex, England, Great Britain, planet Earth, the Solar System, the Milky Way, the Universe. And these girls really are dumb as crap.