The Syndrome series is a collection of games developed published by Human Entertainment. The first three were written and directed by Suda51: * Towairaito Shindoromu: Kyuumeihen * Towairaito Shindoromu: Tansakuhen * Moonlight Syndrome These were the first games he wrote after the wrestling games. These three games set the stage for Kill the Past and are generally considered the very beginning of the series, and characters from them would go on to play minor roles in Grasshopper Manufacture games.