As for information... a lot of the VN is involved with the protagonist's ability to see lucid dreams (dreams where you are consciously aware it is a dream), and it balloons out from there to envelop the rest of the cast in a story that blurs the difference between dreams and reality. At times it is comedic, but there is a definite atmosphere of sorrow throughout the whole thing... not to mention that the various characters also end up having to face their traumas and fears as part of the story ( in the common route, their own paths, or both).