Street Fighter IV takes place several months after the events of Street Fighter II (thus is chronologically set between Street Fighter II and III). After M.Bison's survival following his encounter with Akuma, the S.I.N. corporation began another fighting tournament in order to draw out the most powerful fighters on Earth to complete the BLECE project. Each character has their own reasons for entering this tournament, but S.I.N.'s real desire is to lure Ryu to them in order to analyze the Satsui no Hadō, believed to be the last piece of data needed to complete BLECE.
Ultra Street Fighter IV