One side of the world is always sunny. One side is always night, the moon shining. In the middle, The Twilight Garden. Although Purests hate Monsters, they use them as guinea pigs for experiments amd resources even though they're people too. Luna is a worker in the lab, doing tasks, feeding, and calming Monsters. This story is led by letters, unfolding the true purpose of the lab and perhaps some family matters as well.