Sorry for answering in English because we're not offering technical support with other languages. You can try to buy a Mudfish credit as AUD or USD with Paypal or buy at In-App payment

Thank you for answering! ３カ月前はJPYで購入できました。なぜ今はJPYで購入できないのでしょうか？残念ですが、AUDかUSDで購入しようと思います。

Umm... Something is wrong.  Did you try to process at https://mudfish.net/admin/credits/buy URL to buy mudfish credits?  I can't reproduce your problem at my side.

Thank you for answering！ I'm sorry my English is not good. Yes, I tried to process at that URL to buy mudfish credits. Can you buy mudfish credits in JPY with PayPal? I can't move to the PayPal payment screen when I select JPY. But I can move to the PayPal payment screen when I select AUD.

No idea because I can't reproduce your problem at my side.  :-(  When I clicked an option to buy JPY based Paypal mudfish credits, it works properly. Which browser are you using?

問題解決しました! ブラウザはInternet Explorerを使用していました。Google Chromeで試したところ、JPYを選択しても正常にPayPal画面に移動できました。ブラウザの問題だったようです。Thank you so much!!

Thanks for let us the information When if you get any trouble with Mudfish in later, please check Unsupported Games documentation