I vote for
-Xenoblade 2
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Since it is precisely with combat content, hidden NTR, also characters there are few love interests, only two.
That this game is just right than the others, well, and a new fresh breath than the next familiar to us.
Naruto - well, honestly it's so-so. For fans maybe, but... as a realization... Rakige and Hina? It was.
FATE - well Fujino has experience and a huge fan base. But let's do something new?
Also with the rest, where in the end there is little combat content, there will be disputes like Asuna or Suguha, there are also many girls there.
TO Love - without combat, and it is unlikely to be interesting.
The Quintessential Quintuplets - the same.
Re Zero - I think this is also a great option, but the implementation is complicated.
And agree, there are already a lot of things about them that I find boring.
And Xenoblade is something new, will it essentially be a diamond?