Notes of Demon Slayer

I was living an ordinary life and was exposed to a series of death storms. I gradually went deeper and uncovered the darkness, and at the same time, I gradually realized that I was extraordinary. "Who am I?" A question popped into my mind, and no one came to tell me! The appearance of a notebook and the mysterious man's messages and instructions allowed me and my friends to walk into dangerous places that we seemed to have experienced before, eliminate ghosts in the world, slay strange monsters, solve mysteries one by one, escape from death, and find my true self! … When all the fog was lifted, I finally understood that there was only one secret behind it! (This story is purely fictitious! Do not imitate the things involved in it, be careful of ghosts! Be wary of monsters!)