A man wakes up dead and the first thing the underworld takes from him isn't his soul, it's a piece of his actual body. The horror isn't supernatural, it's immediate and physical. You're watching someone realize they're trapped in a negotiation where the other side collects down payments in flesh, one bargain at a time.
After nodding off at the wheel, a driver named Seita dies and comes to in the underworld. There a demon takes its payment from him, and the price turns out to be a piece of his own body. This single-episode web short from 2014 is a supernatural thriller with action elements, adapted from a one-shot manga that won the top Miracle Comic Prize.