Wakusei Closet
Finished this today and it was wonderful! The plot tries to get a bit confusing at the end but I think it's still understandable enough if you read patiently.
The plot itself was not the highlight, but rather how creepy everything was. The atmosphere and the monster designs are so magically beautiful and scary. It really does feel like a bad dream. It even had some yuri undertones! Would recommend to everyone interested in dream-like horror as it's only 4 volumes.