Liar Game, Yuukoku no Moriarty Recommendations
Mostly I recomend this series because of it's similar atmosphere. Serious with a lot of depth and look inside the horrible minds of people. In Liar Game you get to see how far people are ready to go for their own greed and self-satisfaction, much like the nobles in Yuukoku no Moriarty.
Another thing you might like about Liar Game is the genius of Akiyama that is on pair with L or Lelouch, or William James Moriarty.