Read the instructions.
Did you follow the instructions or did you skip step 3 because you thought setting your locale to Japanese-Japan was enough?
Read Developer Notes->More Install Help for more information, but basically, you must always use a locale emulator.
There are also a
few reports I read, that I was not able to confirm, that the issue was resolved by
setting the time to Japanese Date/Time.
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.
The protagonist is supposed to be named by the player. That is just the default option.