Allow me to be the one to point out the distressing points (in terms of sanity. *grin*
1. It is extremely common for Japanese schools at all levels, even colleges, to require uniforms. 2. Said uniforms often do look like little sailor suits with skirts (I know not why). 3. The toy is most definately what you fear it is. I've seen the model before (don't ask).
That said, yes, it's likely a porno shoot or an amatuer photo shoot. It's unlikely anyone would be that casual about open toy usage otherwise.