Higurashi no Naku Koro ni Matsuri Official Guide Book (ひぐらしのなく頃に祭オフイシヤルガイドブック When the Cicadas Cry Festival Official Guide Book) is a supplementary guidebook published by Enterbrain for Higurashi no Naku Koro ni Matsuri.
- Concept art of characters and backgrounds.
- An interview with Ryukishi07, Kanou Kiichi and other staff.
- A short story Kotohogushi-hen, written by Kanou Kiichi.
- A short manga illustrated by Yoshiki Tonogai.