Seventh grader Hayashi Renei is troubled by a strange dream: Her dead brother, who was killed in an automobile accident, comes back to life as Coo. The dream comes again the following night and then every night thereafter.
 
Coo's world is a cruel one--crueler than the real world, even--with its own share of pain, suffering, and sadness. Renei is searching for her house with her brother and others whom she meets in Coo's world so that she can return to reality and the land of the living... (Source: Kotonoha)

Renei thinks she's going crazy. After many years, she has begun to dream about "Ku's World" all the time, a place beneath the shadow of the mysterious Mount Babiranma which is inhabited by fantastic creatures -Nagizari, God, the little Rey, the lethal teppas- which is where her dead brother, who is going through an identity crisis, may be, as well as her best friend, who committed suicide some time ago and has now returned for her. As she muses on the sense of life, things in the real world do not seem to be going her way either and when the inhabitants of "Ku's World" begin to reveal themselves to her and try to persuade her to go along with them, she no longer knows if her life is a dream or a nightmare. Will they find the answer to the mystery Mt. Babiranma conceals? And more importantly, will they all escape with their lives? (Source: Ponent Mon)

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