The first volume is not officially out yet till August 18, 2020 (unless it gets delayed somehow and with covid stuff anything can happen these days) so currently looks like you can only pre-order this story.
I would suggest trying amazon jp!
I'v ordered some cds from japan through there and if you're lucky it might be possible. Weird thing is that I had to make an jp amazon account and then only some things can be sent overseas (like the cds but tbh I'd advise caution since the case has a chance of breaking with the flimsy packaging these days but book should be fine in comparison.)
Thank you! I'll wait for the release then so I can combine my orders -w-
WHERE CAN I BUY THE MANGA?! I TRIED TO SEARCH ON MANDARAKE BUT CAN'T FOUND ANY RESULT PLS HELP ┗( T﹏T )┛