There may be even larger llama tunes for Japanese... But huggingface is tricky to search.
I would suggest baking the LORA into a ggml file and then running it with koboldcpp (with opencl offloading) for maximum ease of use.
https://github.com/LostRuins/koboldcpp
You could get even better results using Japanese llama.cpp grammar, but I have not been down that rabbit hole: