Any Ace (asexual) representation in any J Novels?
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Like Maomao in Apothecary Diaries where she's just not interested in having a sexual relationship with anyone?
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Makoto in Full Clearing in Another World Under a Goddess With Zero Believers... maybe?
Mind you, there are lots of girls around him who will stop at (almost) nothing to do him, but he's generally not really interested in it and just tolerates them (and none of them succeed until quite a few volume in). And this includes his patron goddess, who is canonically supposed to be more beautiful than any other goddess or human in that world, and he mostly fails to succumb to even her charms.
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The protagonist of Ascendance of a Bookworm isn't ace, but she is a kid that is more interested in books so often comes across that way.
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I consider the main character in I was killing slimes for 300 years and maxed out my level to be asexual, given that she lived 300 years without any sex or romance and doesn't seem to be starting any. That's published by Yen Press, rather than J-Novel Club.