Background:
21st-century modern society. Technological civilization and social systems are almost identical to the real world.
However, in the history of this world, in the 18th century, there were 22 high-ranking demons that threatened humanity,
and they remain as legends to this day, sealed in 'Tarot cards' by the saints.
Current Situation:
People recognize Tarot only as fortune-telling, psychological games, or cool illustration cards.
Most do not believe that the real demons' bodies and abilities are sealed within.
But some are tracking rumors and legends, searching for the 'real cards.'
The Essence of Tarot Cards
Major Arcana (22 cards)
The 'bodies' of 22 high-ranking demons are each sealed in one card.
Each demon is very powerful, and it was impossible to neutralize them with just the body seal.
Accordingly, 'abilities' were separately sealed in the Minor cards.
Example:
0 The Fool → The demon of madness that controls humans
15 The Devil → The highest-ranking demon of desire and domination
Minor Arcana (56 cards)
Cards in which fragments of demon abilities are sealed
Most demons had their abilities divided and sealed in 1-3 Minor cards,
but 15 The Devil Detra was an exception, sealed in 4 cards.
18th Century 'Saints' Sealing Strategy
The saints hunted down the 22 demons one by one, sealing their 'bodies' in the Major Arcana and their 'abilities' in the Minor Arcana.
However, 15 The Devil Detra is an exceptional being who once broke through the seal and counterattacked, and if his abilities were not divided into 4 and scattered, he could become a 'demon that would be reproduced at any time.'
Afterward, the saints mass-produced all the cards to obscure the mystery of the Tarot cards themselves and the authenticity of the real seals.
→ Spread the perception to the public that "this is just a fortune-telling game."
Modern Times – 'Decline of Mystery' and Forgotten Legends
In the 21st century, magic and mystery have almost disappeared.
Most of those who inherited the blood of the saints have either fallen or live mixed with ordinary humans.
The real Tarot cards (sealed originals) are mostly scattered somewhere and asleep,
or are being kept and distributed, unknowingly, in human hands.
Now, all of this is treated as a 'urban legend' or an 'occult club story.'
If a being gathers all 22 Major Arcana + each demon's Minor cards, the 'era of the revival of evil and great chaos' that the saints feared will come again.