Umineko no Naku Koro ni Chiru Episode 8 Shinsou Kaimei Dokuhon (うみねこのなく頃に散Episode 8真相解明読本 When the Seagulls Cry Scattering Episode 8 Truth Reader) is the eighth and final guidebook in the Shinsou Kaimei Dokuhon series and acts as a supplement to Twilight of the Golden Witch.
- Compiled fan theories
- Concept art of various characters and portraits, along with comments from Ryukishi07
- An interview conducted after the release of Twilight
- A release timeline for various merchandise
- Results of several online character popularity polls