This is my favorite anime of 2013 for a reason.
For starters, let's address the big elephant in the room that turns people away: the different animation style. I'm going to be honest, at first, it looks like a video game, but after a while, you get used to it.
Anyways, let's get on to the storyline. The plot of Arpeggio is one of the best out there. It follows Gunzou and his ship, I-401