I have to say I'm happy this series exists and I'm going to miss it. I think it severed a purpose on brining light to issues you don't often see addressed in manga. It would be awesome if this got adapted into an anime.
It would cool if the author continues to explore this little universe (perhaps with Tenmaru or Mai since Sou already had his own prequal of sorts), though either way I'm just eager to see what they do next given the care with which they handle their subject matters.