I recommend Source Han Sans Japanese for Japanese font.
It is good looking and OFL licence(same as LinLibertine).
Ok, I tried the first Japanese link but it seems to fail on my end. Still trying to download from another link.
I can't wait to play Valyria Tear in Japanese! But my boost ver is 1.60, so I can't build code on github now.
This should now be fixed, see: https://github.com/ValyriaTear/ValyriaT ... -190404772