Koe No Katachi
(from MyAnimeList) A one-shot about a middle school class that accepts a girl with impaired hearing. Although this one-shot won the 80th Weekly Shounen Magazine Newbie Best Mangaka Award, the vector of the content made it difficult for publication on any manga magazine, until it was picked up, after months of legal dispute, by the February edition of Bessatsu Shounen Magazine, where it got first place despite its being a one-shot. This one-shot was recently publicized again on the 12th edition of the 2013 Weekly Shounen Magazine.
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Doubt (tonogai Yoshiki)
This is definitely a great example of a psychological manga with very good twists, mystery, and best of all- horror. 'Doubt' is a short series that is based on the familiar plot of 'survival games', something you might recognize if you've ever read or heard of Battle Royale. The purpose is to survive, be the last one standing, but all the while, needing to survive even if you've won. Keeps you at the edge of your seat, an eager read, definitely among the best in psychological survival game horror genres.
Risou No Kareshitachi