Depends on what you mean by RPG. For JPRG, I recommend
SKA, which isn't
grindy (i.e. repetitive), but is gameplay-heavy and challenging on Normal difficulty. If you more liberally mean something that has stats and choices, maybe
Alansya Chronicles and
KoD would apply, and they're good, though I'd struggle to really call them RPGs myself.
Some more JRPGs:
Curse of Kubel
Makina
Detective Steam City