Plot to Worm

The 22-year-old Nongbu lived alone in a simple cottage made of straw and had only his faithful white dog for company. After being worn out by working the fields all day, he had tucked himself in for the night.
Though exhausted, the young man fell into a deep slumber before the room filled with strange noises of groaning and gasping. He tossed and turned under his ragged blanket and his underwear became untied, exposing his bare skin to the cool air. Although drenched in sweat and feeling strangely uneasy, he had endured this night after night.
In order to understand what is making this simple farmer go through a living hell, we must turn the clock back 99 days. Who would have thought that in an effort to save a simple worm, he would be doomed to suffer the loss of his vital energy for the next hundred nights? What does the worm have in store for him?