@knighto Because Nagi is a man of culture.
No, seriously, it is weird and probably only there to make it look like she's still in the running. I mean, the author can't pull a harem member out of the race in chapter 28 (even if they shouldn't have ever been a contestant in the first place), now can they? They have to wait for chapters 220 to 226 to cut out all the other characters, leaving first girl to win even if she's worst girl.
@trapsarebetter Well Persona and Harvest Moon-like games teach me that long term romance start off from interactions and familiarity. Not exactly any different from reality.
Can't understand shit if you don't ever interact with that person and Nagi's dad aren't exactly stalking as he made some effort to interact instead of just looking at her.
Shit, I was half sleep when a read this and thought "so, Nagi's mom looks just like Erika... what's wrong with Japan and the Oedipus complex", totally forgot the main plot XD
The heck is the sister doing there? I know it'd be quick to just remove one of the competitors, but c'mon! If it didn't feel forced before, sure it does now. Just compare the history he has with each of them.