I think you guys don’t understand, but I am so glad to watch this scene.
Because it doesnt matter how many times Koushiro calls her “egocentric” or Mimi calls him “insensitive”, this scene proves that true friends can forget their differences and take care of each other.
Maybe Koumi shippers can be a little disappointed because there has only been a couple of scenes with them (and the other one was an argument), but from my point of view, Koushiro had to be focused on research, so he was not allowed to think about “crushes” or something else during the OVA.
In the last episode of Kokuhaku it was so sweet from Mimi, knowing she was still a little mad at him, deciding to check on him and even bringing him his beloved Oolong Tea. She was worried about him because she knows he’s giving it his all for find out a way to meet their partners again, even though the others were not sure about that. They are really the carriers of the crests of Knowledge and Purity.
So, I dont know about you, but I could see a little koumi development here and I really appreciated it. And with the question: “But what are Mimi’s feelings about him?” .
In romantic meaning, we don’t know it yet. But in friendly meaning well, with this scene, words are unnecessary.