does somebody know how to buy the game on steam for me it says that its not available in my region
If you're also in Germany, we can't buy nsfw games on steam because steam doesn't wanna comply with laws requiring stricter age verification for adult themed games. You can get a friend outside the country to get the game for you or travel outside the country and purchase the game from the steam app on your phone or with your laptop. If you're outside of Germany i cant really help you besides reccomending similar advice.
Wouldn't using a VPN fix that issue?
Or if it doesn't you can get bluestack on a computer, then download the steam app in the APK format and then dowload an APK wich fakes GPS datas... well supposedly 'simulates' it. I used it to play pokemon go on my desktop computer. It would work straight for a phone too though i suppose - same just don't get bluestack.
I mean there are lots of ways to pretend you're somewhere else, some of them might work to cheat geogaphical limitations. Plus i don't think that would count as 'hacking' per se.