Ouch dude, 2 volumes? Too bad, this is one of my favorites. I actually like this manga the best out of the author's.
Edit: not that I feel that this manga needs it, but the author had added some more fanservice or ecchi elements, as sad as it is to say, it might've been more popular. There's a reason why there's so many action cliche and harem cliche stuff out there. Pandering may not lead to the best series (and sometimes it leads to the worst) but adding a bit of it to otherwise fairly intelligent works like this could probably increase the popularity without compromising the core elements that make it appealing.