This is a turn-based game in which players use cards to optimize their battle strategies and strategies, with black and white and occultism as the main tone of the game. What the game may include: turn-based combat/decryption through battles/decision-making levels, players need to play through independent levels, some of them are mainly combat, and some of them affect the overall direction or the final ending of the entire game through the player's choices in battle or in options.

The game is non-linear, and the order of entering each level will also affect the shape of the same level, and players can have multiple ways to achieve the same goal, and the same route can also lead to different results.