Crack theory: Gyaru is somehow orchestrating things to get with MC. She could be lying when she told him that she only has a "hunch" and the loop just so happens to end right after he is rejected - a prime time to sweep in and fill the hole in his heart.
I have no evidence of this besides the possibility that she was lying to MC when she told him she had a "hunch" (saying that you know two people are dating is very specific, beyond a hunch) and a the fact that one of the other commenters said we may have a major twist coming.
Alt theory, just as cracked: Ota is orchestrating this, similar reasons to above, but his outbursts that seem spontaneously revealing are planned and trying to feel out how the MC feels about Ota.
I again have no evidence for this besides someone saying we may have a twist.
I will not be taking questions.