The manga is about after people die, they gonna end in some tower like place. The people forget about their memories. In there , there's a judge who give them a game or ordeal, each people there playing facing each other.

The ordeal is just a test, if they pass, they go to paradise aka reincarnated again as human. If fail, they will go to hell.

The MC was a college girl i guess, she suicede, but did not lose her memory. Because of that, she cannot be judged and temporary elected as assistant judge to the other guy who as another second mc.

In there they judge many people, the idol man and his girl fan, the husband and wife, a man who kill a detective that make her sister as a bait on rapist, etc.

Sounds like Death Parade but its an anime not a manga.