I've never seen someone describe Hachiko's works so well before. Congrats man.The author is pretty much hit or miss regarding couple progress, ie dating. It either takes 40 chapters and no progress is made, or it's a gag manga where everybody is fucking. Let's see how this will turn out.
She’s shown her pure-hearted maiden side in some instances, like when Yui tried to pull a wingwoman with the ice cream and she got bashful because “it would be an indirect kiss 😳”. Akari is just hiding it behind her anger, and with the fever only the truth that she’s in love and sees Hina with the same affection as before comes out.Did she regress to her elementary/primary school days during that fever? That's the only explanation I can think of for why she was so pure-looking then.