Shadow Hearts is a series of role-playing video games, consisting of a trilogy of titles for the PlayStation 2 (PS2) and their predecessor Koudelka for the PlayStation. The entire series was developed by Sacnoth (later Nautilus); Koudelka was published by SNK in 1999, while the Shadow Hearts trilogy were published by Aruze from 2001 to 2005. Multiple other publishers handled the titles overseas. The Shadow Hearts chronology extends from the late 1890s to the 1920s, following different casts of characters caught in supernatural mysteries. The setting combines alternate history and cosmic horror, with real-world figures making appearances, and each title has multiple endings.