The Deathbusters have captured someone from the Sailor Guardians team and replaced them with a Daimon imposter! By asking the team members questions and seeing whose answers don't align with the rest of the group, the team can unmask the imposter and direct the rescue of their captured teammate before it's too late.

In Sailor Moon Crystal: Imposterous, players take turns asking intriguing and open-ended questions related to the Sailor Moon Crystal series. Each player writes down an answer that they think will match the answer given by other players. The more answers a player has in common with the others, the more points they receive. The suspicious player with the fewest points each round, i.e., the one whose answers are most dissimilar from those of other players, might be the imposter and their pawn moves down the game board.

When a player — or multiple players! — exit the last space (Level 6) of the game board, the game ends with the imposter(s) having been revealed. All the remaining players win the game and rescue their captured teammate!