The problem is many of the image files have illegal characters in the filenames from the Japanese characters being converted (see title images screenshot). I changed the name of the title image file to "Title" and replaced the Japanese name in the system.json file (see system json screenshot) and I was able to get the title screen to load, but I clicked newGame and immediately ran into another similar error message.
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The problem files already exist in the zip before they are extracted to my machine. Doesn't matter what language my machine is in, this game will not run because it is calling filenames that don't exist. I suggest you reupload the zip after confirming that the filenames being called match up with the names of the files in the folders.