Love is not new to My Hero Academia, but the series has never dived into the world of love triangles before. However, that will soon change as it would appear as if Makoto has a crush on Koichi. This crush will likely not last for very long though.
You see, Makoto doesn’t have any form of emotional attachment to Koichi since it's all based on logic rather than anything else. Now, in her confession to Koichi, she reiterated to him that she has no plans to make a serious move until he speaks with Pop Step.
If we remember correctly, Pop Step has feelings for Koichi, and this has been a long time thing. She has always avoided him as to keep from sharing her feelings, but such actions cannot be allowed to continue, because as Makoto made her move, Pop was listening outside.
As it stands, then, Pop is preparing herself to fight for Koichi, and we have a feeling shell come out on top. Then again, Makoto could be doing this just to force Pop to confess her feelings, but we will just have to tune in and find out.