The anime has an interesting setting, in which those of high social status live better than those below them (No Brainer) and all live within these domes where malevolent creatures are a threat. I enjoy the fact that our female protagonist has an internal conflict to deal with in the beginning of the anime, and later has both internal and external, as she bonds ever so slightly to her instructor.
I rate this an 8/10 because it has a great opening and ending music. The colors are beautiful and portray the characters in an appropiate manner. The anime is by no means boring, as event after event lead our protagonists to become closer. It is to be taken seriously but is not afraid to liven up the audience here and there so long as it is the time to do so. And it is a great story and a getaway from current mainstream anime.