Chihayafuru's anime series is one of my favorite despite I have never read its original manga. Poetry as main theme was strong at the time of its release, I was also wathching Utakoi at that time. For quite a while I was waiting for 3rd season, then lost interest, and now we are having Chihayafuru live action adaptation.
Perfume did well for theme song, it serves you ample dose of optimism and melancholy at the same time, to the flavor of the anime.
Despite being currently in Japan, watching its premiere is still no-go for me as things may got lost in translation (my Japanese sucks, literally like a black hole). I'll just wait for D-Addicts for English subtitle and re-watch in Japanese later on.
Too bad the pronunciation is closer to "flush" rather than "flash".