I'll admit it: to a major extent, my enjoyment from Tokyo Ravens was due to seeing how their relationship developed- even though really, Tokyo Ravens is not particularly based on romance at all: it's more of a adventure, mystery type anime.
I think what was really refreshing to watch was that both Harutora and Natsume weren't anime characters that could be easily listed under a category (for example, tsundere, kuudere, etc.). In other words, they weren't always predictable.
I especially loved the last few episodes- and although I really would've preferred a much better conclusion, I'm satisfied with how my super cute OTP turned out!