The game's original tease (when epilogue update for OIAL was released) had crimes of varying degrees being committed within Eternum, so regarding rape and ntr, well who knows.
Regarding Japanese names, lol is it really an issue?
I mean the way that the characters look, not like you can expect something really radically different given it's a Honey Select (HS2 for Eternum) game (though personally, I have no issue with how they look).
Also, I see no point in giving them Japanese names unless the game itself is set in Japan, or the character is actually from Japan i.e. like Aiko's case for OIAL.
If you mean by "completed versions" as completed games, well you're gonna be waiting a long time, considering this game has just started.