UBOK.

Overview
UBOK. is a collaborative project between SDS (TwitterPixiv) and RAHU, the latest version having been released in 2011. The game's production was cancelled in mid 2012. It stars Eric, a relatively wealthy hikikomori who via his bed explores the realm of his dreams.

The game is known for it's medical and skeletal motifs.

Plot
From the various effects and areas in UBOK., it is possible Eric had some sort of bone complications/surgery that affected him throughout his life, or was a rather sickly person growing up. He most likely kept notes/a journal of his days, which is what you find scattered in his dreams.

Effects and Items
In UBOK, effects and scattered pages can be found in Eric's dreams.