Well there was also this time where Sensei said the L word to Chika (in dorm wars) and apparently Chika isn't on the list, so it's kinda hard to know who he really loves (though I will admit I completely forgot about this scene with Makoto)
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Did someone in the game said that it was the first in a series? "The Light of Last Summer" is one of the first events in reset 4, and in the Nodoka fan meeting some fans talked about one of Nodoka's previous work named "Everyday I Grow Some More" which is the very first event in this game. So maybe Nodoka started remembering about past resets since the beginning of chapter 3? The contents of "The Light of Last Summer" could also begin from the start of the game, but then what is "Everyday I Grow Some More" about?
I feel like the Room with Clocks ending is hinting at what happens between resets.