Based on her personality and how much of a ditz she is, I get the feeling she has a habit of misunderstanding situations all the time, leading her to make false assumptions. For example, in this chapter we see the MC looking at a girl up the stairs, in which the childhood friend assumed he was looking at them romantically, BUT, I feel he was just looking at her because her panties were in full view.
So yeah, I feel this manga is just going to be a bunch of misunderstandings from the childhood friend's perspective.