When Chapter 5 ends, the game does not let you finish.
The screen fades, and then — you are back in the late-night room from Chapter 1. The same stack of old workbooks on the desk. The same film re-release trailer on the television. The clock still reads 23:47.
The first time, you'll assume it's a bug. Or some kind of easter egg.
By the second time, the third time, you understand: Yuki is repeating.
This mirrors one of the most characteristic signs of Alzheimer's — repeated questions and statements: unable to retain what they have just said or asked, a person will repeat the same words again and again, entirely unaware that they are doing so.
And that is the heart of the design:
He doesn't know he's repeating. You're the one who notices.
At seventy, Yuki can't return to the present. Recent memory is going; distant memory remains — so he goes back, over and over, to those nights between 1989 and 2019. To him it isn't repetition. It's the part he can still reach.
You stand outside the screen and watch him pick up that photo frame for the fourth time, and say the same line for the fourth time: "He poured so much into writing these — and so much regret."
That gap in awareness — he has none, you have all of it — is where the whole design gets its weight.