[It may be a pleasure hell in this world, but it's gone missing in the other world.]
The protagonist, Yumeji Yoi, is plagued by a certain dream every night.
It is something like the so-called "urban legend of monkey dreams," but it
is clearly not the same, and every night she feels terrified to go to sleep.
The dream is that every night, the women sitting in the train seats fall into pleasure.
The women who fall into pleasure always turn into lumps of flesh.
Although Yoi is frightened, her body reacts to the sight of the women being assaulted by pleasure.
But that night was different from any other, and the evil hand finally closed in on Yoi.

Can you bear this fear?
Riyan, oh?!