This anime will grab your full attention from the start and never let go. It begins with a couple arriving after their death in an unknown place where they are to be judged on whether they deserve to be reincarnated or sent to the void. In order to be fairly judged, they must play a game. It is during this game that their hidden darkness is brought out. At the end of the game the arbiter will make the decision on who will be reincarnated and who will be sent to the void.
The main intrigue in the show is that none of the people have clear memories and it's throughout the game that these memories are brought to light. The memories can make a person react very differently, as they realize how they've been hurt in life and how they feel in general about the life they lead.
The show does have it's issues. The existence of the arbiters is somewhat explored, but never fully explained. Why do these beings exist? They don't even know that themselves. There's also a god-like character who's purpose is never discovered.
These flaws don't stop this from being a great show however. I highly recommend this anime if you like psychological thrillers and want to delve into existentialism a bit.