Oh man, these facial expressions are golden. Nice that this misunderstanding was cleared up in one chapter, and our GOAT, Kirishima, is cool with this (maybe didn't have much interest in that girl in the first place).
Nayu is starting to realize she wants to be more than friends with Hikoichi. Time for her to step up her game to get closer to him, and she's got common ground to work with to get conversations going. Though I think just getting his LINE ID would be a simpler move, as that would give her an open route to be able to chat with him at her leisure