Games like Synthesis

If you finished Synthesis, the closest matches are Danganronpa Another: Another Despair Academy, Super Danganronpa Another 2 ~The Moon of Hope and Sun of Despair~, Present Memories: A Vox Akuma Fangame, Danganronpa: Checkmate and Canadian Higurashi. All 10 share its visual novel genre and are ranked by how closely their themes and modes overlap.