Watch Out for the Dream Demon

A shy wallflower found himself becoming fast friends with the most popular boy in class after being late for his first day at school because of a month-long sickness.
But this well-adored Mr. Popular turned out to be something unhuman!
As a demon that feeds on dreams, it found the wallflower's nightmares tasty, "Your dreams look so delicious~"
Since when was it so hard making friends that one has to be careful of knowing a demon that loves eating dreams?!