As one of the comments on the game page says, the password is this. It works. I checked. 72496
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I wonder if anyone has made a text walkthrough, with a description of how to get the endings? Even when I saw many different endings that depended on non-obvious actions, I was surprised that there were still some CG variants associated with the ending that I did not see in the game. However, perhaps those images were something that is not used in the game. This is quite possible, considering that in the game files I found images that were saved directly from the AI image generation, even without changed names.