Here is an overview of the update, via Aniplex:
Welcome to the Monster Party—a festival held by Demon King Deathgawd, who previously faced off against Wright, the hero of RPG Time!
Players will take control of their character and wield pen, paper, and dice to play a board game and collect Demon King Badges. Depending on their paths, players will experience a variety of imaginative events, and the character who finishes with the most Demon King Badges will be crowned the victor
View a new set of screenshots at the gallery.