Hello lilasaka! ^_^
If there's no text, there's a chance you don't have the right font.
First, make sure your computer's System Locale is set to Japanese, and then we'll make sure your computer has the proper font!
click on the White Windows Icon in the bottom left, then type "Fonts" into Cortana search. Select the "Fonts" folder from the list. Once a window pops up, this will list all of your computers' fonts. Look for one called "MS Gothic Regular". If you don't have this font, you can follow this guide by Microsoft to help install the language fonts.
How to add an input language to your PC - Windows Help -
Adding a language won't change your system to that language.
Try that, then try the game again. ^^