Sift Heads are games that form a saga. The story is set in a dark world, with red and black.
Black represents the dark side: weapons, mafia or drugs, and violence. Red, meanwhile, represents the blood that is shed as revenge or as reckoning.
The hero of Sift Heads is Vinnie. He quickly finds a girlfriend in the person of Shorty and a support in the person of Kiro. Between them, they hope to reckoning and kill the bad guys.
There are about twenty games that constitute the saga of Sift Heads.