Aside from 'Basics of Stealth', which was kind of weak, I really love this mangaka's works. The introspective voice really draws you in, for one thing, but I think it's the art which really makes it shine: the charming touches or subtle details, even when not fully polished like a lot of Nishikino's faces in this one, have a really heartwarming/occasionally beautiful effect.
I see people complaining about getting tired of schoolgirl yuri all the time, but I think this is one author who does it well.