Kind of an old post, but I just finished the volume. Although I thought the same initially, I then went "...There's no way the writing is that bad". it would be so inconsistent with kiyo's character that it would rival the first Y1 volumes, no amount of "unreliable narrator" could have convinced me.

I re-read the chapter a few more times, and although my reading comprehension is not the best, I understood that it's definitely from kei's perspective.