I can see why the second season is better than the first one. Script is better, emotions are portrayed better. It's a lot of fan service, less of shogi and a bit more about what drives the players, it's shows the human side of the so called "robots" or "demons".
Also a lot of focus on the people who have a positive impact on the protagonist and development of hints towards some romance. Although I did miss any sort of character development of the step-sister and her relationship, which was completely absent.
Overall, good and sweet. Dare I say, addictive? I'm looking forward to a third season and how things play out.