Bra shopping for bigger busts?

Hi! So I need a new bra, but I have not super common proportions and get really nervous about entering small boutiques. Can someone recommend a store for me? Uniqlo and Co did not carry a size that worked for me last time I checked (big breasts, smaller ribcage). Online shopping isn't an option because I have to be able to try them on. Shopping for bras has always been kinda difficult, even outside Japan and I feel like it won't be better here.
I'm not in Tokyo but Fukuoka if that changes anything.

by 0rnitorrinco