I kinda wanna buy this— does this have a physical copy?

sadly no I dont see any plans for it either

I think there is a physical copy but it’s in japanese.

For physical copies, maybe amazon is your best bet but it would be JP only, there's no official translations. Easiest way to support author though is by buying through online. What i do since delivery is expensive and online make's it hella easy. I recommend booklive or cmoa to purchasw this author's works