You can try purchasing DLsitePoint.
DLsitePoint can be used to make payments at Ci-en ヾ(•ω•`)o
If that doesn't work, you may need to ask your credit card issuer for help.
I'm sorry, but it didn't help either, the payment systems refuse to accept, maybe because of my location, I could buy it on itch.io probably, but unfortunately not.
