I was listening to the Death Parade opening song song last night and I got the urge to watch Death Billiards. Death Billiards is the OVA that eventually lead to Death Parade. It's about two people who have to play risk their lives while playing a game. In the spectrum of Death Parade episodes that had this format, it's below average lacking any momentous revelations about the characters. Never the less, it's exciting and entertaining and defiantly worth watching if you enjoyed Death Parade.