Regarding Minori's serendipitous arrival (heavy spoilers), I thought it was a coincidence too. I am not diligent with notes anymore, but a piece of paper in my recycling box contains: "19 0:18" (obviously incorrect offset), "Oh shit, it's Minorin taking her sweet time getting to the party" (meaning that I sensed the danger during the build-up for the scene in question), and "R. & M. meet in front of the school". Curiously, Taiga's wailing did not end noted, although I remember it. On the other side it says "Hilarious: the female trio, all alone" and "Christmas ED", so that was later. And that's all.