Then, the event takes place on december 28 because it's always december 28, even if it is two days after it. The days in Kumon-mi, as the passage of time, are fictional - in the real world it's always dec 28, they never left. No one ages, nothing changes, and even when they do, it reverts back.
The next two days don't actually seem to change the date, as it's still said to be Dec 28th during 'Untitled':
Isn't this boggling...
If you load a save and play through these events while paying attention to the weekday indicator, you'll find that Sensei spends Wednesday and Thursday to persuade Yumi and Tsuneyo to come to the sleepover, then on
Friday the "Today is 12/28/20" Sensei monologue takes place, then on
Sunday the sleepover begins, then it
remains on Sunday when amiokay declares "Today is 12/28/20". Script-wise, there is a
totaldays += 2 and
day = 7 in that event, so a normal passage of time is at least consciously set by Selly himself during some part of the event.
Thus, if the weekday indicator and the script are valid evidences, I think at least up until the sleepover is cut short and before everything goes beyond common logics, the flow of time from Sensei making calls to RAS assemble is in the right speed and direction, cementing the idea that the sleepover really is
12/30/20. The question then goes to "Why does amiokay says it is 12/28/20 after cutting off RAS sleepover?"
A few options I have are:
- Perhaps this is amiokay directly taunting Sensei's previous introspection, mocking him about trying to figure out something but can't. The actual date is 12/30/20.
- Since actively researching resets is apparently strictly prohibited, perhaps this is an indication that RAS's efforts in gathering people together gets undone by some mechanisms similar to renpy rollback. Sleepover thus becomes "did not happen" due to time reversal and the actual date has gone back to 12/28/20.
- Team HOPE forces the date back to 12/28/20 in a deliberate attempt to have the 5th reset puzzle take place on Himawari's birthday and have her participate as well (hence the
Untitled Children's Show). It has nothing to do with when Sensei makes that monologue or when RAS arranges sleepover. What team HOPE wishes to achieve via this is unknown.
- Selly fucked up. Sensei should've had that monologue
during instead of
before the sleepover.
- It doesn't matter. Regardless of when you arrive here, you'd better believe it when a trans-dimensional girl tells you today is 12/28/20 while the fabric of spacetime is melting.