Nemurihime: Dream On Dreamer [眠り姫 Dream On Dreamer]

Ayame finds herself often in a numb state. She suffers from a disease which causes her to feel sleepy regardless of the time. Ayame also has a reoccurring daydream. One day, Ayame daydreams that her younger sister Hiiragi dies. This time around she'll have to fight her own dreams.