As already mentioned in the article, this game is not localized.
As for the empty log box, please refer to the troubleshooting section.
Please change from "English" to "Japanese".
Not "Japanese" to "English".
The key configuration cannot be changed in the game due to Pixel game maker MV specifications, but you can change the button layout in the menu that appears after pressing the F1 key.
If the fps of the game sometimes drops, you may find it more stable to make the game full screen by pressing the ESC key.
If the game is still not stable, please let us know your PC environment so we can help you in the future.