Umineko no Naku Koro ni Shinsou Kaimei Dokuhon (うみねこのなく頃に真相解明読本,When the Seagulls Cry Truth Explaining Guidebook) is a series of guidebooks written by Brain Navi and published by Futabasha. Each book goes into detail of the episodes of Umineko When They Cry and includes things such as fan theories, character notes from Ryukishi07, interviews and other material. Eight books have been released, with each one corresponding to the eight main Episodes.
