@Lukasio The first two volumes are as far as I have seen uncensored. And I doubt they are gonna censor the remaining two. In germany, violence in manga is never really an issue.
But the volumes have a "Recommended for 18 years and older" at the backcover, and despite this being just a recommendation from the publisher, some shops take this very seriously and won´t sell it to peope under 18. Also, the volumes are in a transparent sheet (not sure what the correct english term is. I am talking about the stuff that is also around DVDs/Blu-Rays in stores) so you can´t look inside them before buying.