It's suprising that You are from Germany and You dont know english... but even more suprising that You don't know that You can't buy Hentai games in Germany... it's being blocked by Your gov, as German You are not allowed to use Hentai or other Adult games - it's illegal that's why its blocked on both Itch and Steam.
There is a lot of things that someone may like or not in LonaRPG, but in general it's one of the best RPG Maker games that was ever made... well still RPG Maker game but at least refined to its maximum.
In fact Germany is one of the most fucked countries of EU that simply blocks everything... except imigrants from africa... and their prices sucks for buying games...