Discover card and japan

Hello! This is my first post ever, and I am in desperate need of help. I am a study abroad student here in Japan for an entire year (11 months). Due to the terrible decision capitol one made to switch from MasterCard to discover, I am now struggling and stranded with very little places (specifically online like amazon.jp) taking my card. Is there a way to fix this issue by maybe opening a bank account here or getting a card, or maybe even a payment service like paypay. I am in desperate need of help, I feel like Im stuck here without money because of the stupid decisions on captiol one's part.

by Timely-Freedom-9649