So, after looking arround for a bit and downloading the japanese version I found this zip archive which is supposed to countain the high resolution cg version (1600*1200) of the game.
Sadly, for whatever reason, OneOne1 decided to lock this archive with a password that you are supposed to get once you finish the game, Been looking for hours to get the password but impossible to find and since I don't read japanese I can't play the original game to get it.
So I'm uploading this locked archive, hoping that a kind soul would somehow find the password.
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Edit : password is twilightapostle