I am from Germany, if that says something to you.....
Nope, nothing at all. Steam works differently in germany? Works fine where i live.
Google can also help with these things, if you're german you should be able to do basic search.
But i'll help out my fellow europens, i've looked and haven't found the game on steam.
Germany has stupidly strict rules about content, afaik.
You can only get the games legally? No vpn shenanigans?
The problem can be split even between Germany and Valve.
Germany - and in future the most EU countrys - wants a propper age verification.
The "enter you age" bullshit on steam counts not as a propper verification - no shit ...
To be honest, there has to be done something to enforce juvenile protection on steam.
Germany want something, but has no solution how to solve the issue, and Valve are just lazy fucksticks that don't want to deal with this kind of shit.
Long story short, because valve are lazy bastards they have decided to geoban all acces to lewd content on steam. The joke about this is, that ban counts only for adult games - 18+ shooters or other brutal shit can still be bought.
For the stupid Valve idiots is a depicted vagina/penis worse than blow up some noncombatants or cut someone the head off with a teaspoon ...
Till now it's easier/cheaper for Valve to ban a fraction of the german player base than put effort into a age verification. Only 'till the EU just says "Nope" they have to roll out a age verification on all 18+ titles - no matter if the title is Sounter-Ctrike or Fuck all whats no on a tree at four.
And no, VPN dont works 'cause of the account location, that is not changed by a VPN.