The Book of Psychic Events

There are things in this world that cannot be seen, cannot be explained, and cannot be resisted. They may exist quietly around people and appear in front of people at any time. But when they do occur, they are often accompanied by unspeakable dangers. It's a matter of life and death.
The Office of Special Events Handling specializes in dealing with these fantasy cases' response department, known as "Collector."
One day, the Collector picked up a young man on the street. He was covered in blood, but there was no wound; he lost all his memories, but from then on, he was able to see all the visions that others could not.
He became the Collector's surplus, a "piece of information" that could understand everything and a "rare treasure" that had to be protected at all times.
Another day, a man in a long robe and a long sword descended from the sky. His sword cleaved away the danger approaching the boy, and with his sword, he also got a bed in the boy's home .......