One day, the news suddenly reported that a mysterious man sent an invitation to the whole world. After completing 6 dungeons, those who survived would get more money than they could spend in a lifetime. People rushed to participate, but no one came out safely. The protagonist group was also invited to participate. The invitation only read "You are sincerely invited to participate in "Rotten Apple" - Nai". Who is Nai... Everyone took the risk to find out...
Purpose: Seeing through the evil of human nature