In the Headhunter's wake, the Arrivers take a much-deserved break before getting back into the dungeon to try their hand at uncharted territory on floor 21—a decision they will all come to regret. Everything seems to be going well until they reach the boss, where they find themselves in a fight for their lives that the party won't soon forget... Tensions run high in the aftermath, but more adventure than the Arrivers ever dreamed of awaits them just around the corner. When your past and present haunt you, what do you have to look forward to but the future?