Yeah. I’ve got two options with a bank and an online broker firm.
if you just wanna store the yen (not investment). Consider opening a HSBC Everyday Global account, you can get access to 11 currencies in a single account, can even place FD in your desire currency (FD rate follow the country’s rate)
I had similar issue when I moved to Malaysia. Bought the ringgit using Wise. I tried saving money at Wise, but after deduction from all the charges, I feel like I’m only losing money.
You can explore brokers like IBKR (Interactive brokers) with a 4% on uninvested cash Or Hisense brokers (my preferred for this) going by their more effective currency flexibility methods and interest returns. I personally love the ease of access. Do your research on these.