Basically,if you never played a Shin game,there are typically 3 different alignments.
Law,Chaos,and Neutral. Law, who try to preserve the system and bring it back together; Chaos, who try to break the system; or Neutral, freelance mercenary types. This not only affected the storyline in the game,but one of the most important part of alignments we're demons you could align yourself with.
Me personally,have always went with Chaos.I love the chaotic demons,plus the endings tend to be good 8D