From the artist's website: サーニャの正体は同志スターリンの密命を帯びたロリコン狩り専門の秘密警察だったのだ! "Natural shape of [saniya] was the [rorikon] hunt special secret police who has the dense life of like-minded Stalin's" (babelfish...)
blah, bablefish. OK so what the artist is saying is more or less this:
"Sanya's true identity was actually that of a member of a secret police force specialized in hunting down pedophiles, acting on clandestine orders entrusted to them by Comrade Stalin."
Woops, I was a few minutes late in posting and Anonymous beat me (was looking through the particular article since I was curious what it was). Sorry for being redundant...