That's good to know, as I've got the second volume and will get the third by the end of the year (kawakami is the author I've read the most volume from), and I was seriously disappointed by the first one. That volume simply lacked almost everything I liked from kyouhora.
I 'll have to say that I do not consider Sayama to be that great of a MC though. I think Masazumi and Mitotsudaira makes far more interesting MC than Sayama ever was.
Well technically he can add as much series as he wants in each Era so probably not going to stop here indeed. And from the first volume, it really felt a bit outside of the whole cycle tbh. I'll see how he's going to develop and conclude that before saying anything more on that point x).