Well, have everyone forgot that the first chapter were actually "in the future" where they are "newlyweds" so just because of this reason any sort of NTR will not ever happen and they actually do end up together.
However if I am completely wrong about this they do not end up together or something shit happens, my rating would go from 9/10 to 1/10. I would actually be affected negatively to the point of being suicidal.
A little annoying Kei's going the whole "Are you faithful" inquisition routine with a girl who dropped her university education and moved to a frozen backwater in the country just to be with him.
I love how Aki turns tsun tsun to Keiichi when she get's flustered lol, and quickly turns dere dere being out of sight. But yeah so many NTR possible scenarios there, and with a new girl it seems Aki's gonna get a piece of her own being jealous.