The soundtrack is wonderfully composed ranging from ambiance to fast-paced J-Pop.
In terms of animation, it is very fluid; colourful and dark and visually looks beautiful.
I really did enjoy this series, however it is ruined and almost destroyed by pointless fan service; there is an entire episode which has nothing to do with their situation and pushes all of the huge-breasted females into a bathroom feeling each other up, with the male characters (only 2) loading guns. It's fair to say that this almost killed the show but I managed to see through this and found it fun.
