Quick answer — Ryukishi07 worked on When They Cry Kai (Original Creator), When They Cry (Original Creator), When They Cry Rei (Original Creator) and 8 more anime.
Ryukishi07 worked on When They Cry Kai (Original Creator), When They Cry (Original Creator), When They Cry Rei (Original Creator), Higurashi: When They Cry - GOU (Original Creator), Higurashi no Naku Koro ni Kaku: Outbreak (Original Creator), Higurashi no Naku Koro ni: Nekogoroshi-hen (Original Creator), Higurashi: When They Cry - SOTSU (Original Creator), Ura☆Higu (Original Creator) and 3 more.
