Yukari Niijima's life has become pretty boring lately. She just goes through the same old routine every day: work, ride the subway, sleep, repeat. But recently, something strange has been happening. Every night, Yukari finds herself trapped in weird and creepy nightmares. In these dreams, she's in strange places, solving puzzles, looking for keys, and trying to avoid scary creatures. Sleep used to be her escape, but now it's more like a battleground where Yukari fights to keep her