It isn't just Sonys fault you're not getting this game.
The rating boards for the united kingdom, Ireland, Germany, Australia and New Zealand have all banned the game.
The issue isn't just "boobs" so all of the "we can kill people but not allowed cleavage?" Posts in here are meaningless. The issue that is taken with this game is sexualisation of underage characters.
Here's what the rating board in the UK said in there statement for why the game is banned.
"he game is explicit in its setting within a “school” environment and the majority of the characters are young girls – one child is referred to as being a “first year” student and is seen holding a teddy bear. The game clearly promotes the sexualisation of children via the sexual interaction between the game player and the female characters. "
Yeah, if the girls we depicted as being older, than it wouldn't have been banned.