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(+1)

As I said - Windows Defender. It doesn't make an identification for me, it just refuses to let me execute the file. 

I must say I have never seen anything unzip, yet have a zipped folder remaining. Why your images are in a zip file within the game folder after unpacking, I can't say. Maybe that is the issue with Windows Defender.

(-1)

I have now certainly confirmed that it is caused by "Windows  Defender".

If the error can be reproduced on my computer,i have Microsoft analyze it.
If you're in a hurry, change your Windows Defender settings and set an exception for the downloaded file.

Or maybe the ZIP file cannot be opened?
I had something similar case before, and I've solved it by putting my files on another server, can you give it a try?
http://dindin.sakura.ne.jp/voero2020/hokenya_yukarin_en.zip

(+1)

So I had Windows Defender scan your download, as well as the TZM3.exe once it is out. There is no doubt whatsoever that a trojan is present in your game.

Win32/Wacatac.D8!ml

(+1)(-1)

Now, I bought a computer with Windows 10.
And I confirmed that the virus you pointed out was falsely detected.
Therefore, i submitted an analysis request to Microsoft.

If you're in a hurry, change your Windows defender settings.
(+2)

At the very least, you should remove this game until it is clear a trojan is not present.

(-1)

The analysis results are back from Microsoft.

And I had them take measures to prevent false detections.
If you're still enthusiastic about playing games, check it out.

I think the analysis result of "A story about getting a reward from Ms. Zun" will take a while.