L.G.S.: Shinsetsu Houshin Engi is a sequel to S.Y.K: Shinsetsu Saiyuuki by Otomate.
S.Y.K: Shinsetsu Saiyuuki is a otome game for PlayStation 2.
S.Y.K: Shinsetsu Saiyuuki Portable is a port of S.Y.K: Shinsetsu Saiyuuki for the PlayStation Portable.
S.Y.K: Renshouden is a fan disc of S.Y.K: Shinsetsu Saiyuuki. You can enjoy sweeter love stories with target characters and past stories, which were previously untold.
S.Y.K: Renshouden Portable is a port of S.Y.K: Renshouden for PlayStation Portable.