Twenty years ago, a secret experiment codenamed "Project Fool" failed, and all crows in the world disappeared within three days. Scientists call it the "crow silence incident" and classify it as an unsolved mystery. No one knew the real goal of that experiment - to awaken the "corridor of cards" inscribed deep in the human brain with seventy-eight psychological archetypes.
The only successful sample was an embryo that was still in the mother's womb. His name is Kirishima Saku. On his twentieth birthday, the tarot card system in his body was automatically activated.
He is the only one in the world who can use Tarot cards.
The moment he opened the card, he thought it was luck. The fateful save allowed him to avoid a fatal car accident, and the trace erasure allowed him to disappear from surveillance. He thought he could hide this power and spend the last two years of college like an ordinary person.
But he soon discovered that he had been targeted long before he awakened.
The Silent Voices - a secret organization formed by survivors of the experiment twenty years ago - have been waiting for Sample Zero to awaken. Their cadres are not ordinary people, but "closely exposed persons" who were swept by the experimental shock wave. That shock did not give them a complete corridor of cards, but it left an irreversible reverberation in their consciousness.
This kind of reverberation is called echo. It cannot evolve and only has one form in its lifetime. Branded echoers can harden their skin to the density of metal, and the burning sensation gets deeper with each use, until the skin falls off. Whisperers can hear the emotional noise of others but can never turn it off, and most people eventually actively destroy their own hearing. Echo type
