If you liked
Liar Game
|
...then you might like
Doubt
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The two series are very similiar. Both involve trust and lying for your own gain with a lot of emphasis on human nature and psychology. While Liar Game is more about money, Doubt is more about a persons life, but both have the same basic idea of playing a game with a lot at stake.
If you liked
Soul Eater
|
...then you might like
Kuroshitsuji
|
While hardly related these two seem to appeal to people who like a good mix of action, drama and comedy. Kuroshitsuji is based in England in the 19th century while Soul Eater is in another world all together, but both have fantasy elements that verge on the dark side (for Kuroshitsuji it's demons and for Soul Eater it's witches and black blood). Last but not least they both have great casts of likeable characters and both series feature beautiful animation in their own respective styles.