Truly the bridge between OG Higurashi and Umineko... A must read for fans, vastly better than the OVA that skipped out on all the expanded lore.

Edit: Do NOT skip the excellent Rena chapter, ignore the speed readers. It has some fan service but it's no worse than the main chapters, and skipping it will mean missing a great scene towards the end revolving Rena and how she influences everyone to always try their best.