Fragments (カケラ Kakera?) are bits of light that represent parallel universes. Bernkastel refers to fragments as "books" and gives them different names. These parallel worlds can be viewed from the sea of fragments within the Meta-World. The only characters that have demonstrated an ability to travel between fragments are Rika Furude, Hanyuu, Bernkastel, and Lambdadelta. Fragments play an important role in the When They Cry franchise, most notably in Higurashi no Naku Koro ni and Umineko no Naku Koro ni.
Higurashi no Naku Koro ni
In Higurashi no Naku Koro ni, Rika Furude and Hanyuu travel between fragments after Rika's death in search of a world wherein Rika survives June 1983. Each chapter within the series takes place in a different fragment.
Umineko no Naku Koro ni
In Umineko no Naku Koro ni, fragments are used as Game Boards by the supernatural characters within the story.