Yes, it will remain the same at $9/month (900 yen/month) even if you move to the Standard plan.
The price will remain the same until February 2023.
After that, it will move to $15/month (1,500 yen/month).
However, once your subscription is canceled or not renewed due to card payment error, etc.,
the new price of $15/month (1500 yen/month) will be applied from the next.