I knew of the manga, but I didn't know the manga went on so much longer. I'll definitely be reading it sometime. :D

Haha, that's some Wikipedia clicking! Though not a far stretch. When I was watching Summer Wars and saw them playing hanafuda, I immediately thought of karuta and Chihayafuru. Chihayafuru and Summer Wars both made card games intense! The Chihayafuru anime is quite pretty. I think it's a great adaptation. :) (and I love hearing Arata's accent)