Mmmm, OT3 is probably the wrong word for it. It's just that Makoto spent the whole movie worried about romance breaking up their friendship, turning her-and-Kousuke-and-Chiaki into her-and-Kousuke or her-and-Chiaki or Kousuke-and-someone-else. Splitting up the team. And then at the end Kousuke kind of goes off with his girlfriend and Chiaki goes off to THE FUTURE and Makoto is a bit alone, but there's an understanding that they'll get back together when they can, even if it's a long way away and only sometimes. A close & platonic friendshippy ending, let's say.
(I was actually chanting "don't kiss, don't kiss, don't kiss" in my head during the goodbye scene. And then they HUGGED, and it was amazing.)
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(I was actually chanting "don't kiss, don't kiss, don't kiss" in my head during the goodbye scene. And then they HUGGED, and it was amazing.)