This was a time traveler who liked to cause trouble. He was born with powerful spiritual power, and many monsters were no match for him. After defeating many monsters, he imitated Natsume Reiko and made a book of friends, and then died young.
After reincarnation, he lost all his memory and became a bandage spirit who loved committing suicide. Then he was approached by a cat named Madara who asked him to return the name on his friend's account.
Bandage Spirit: "Why do you need me to return the name?"
Madara: "The Book of Friends is closely connected to you. The demonic power of the monsters in the Book of Friends will be transmitted to you through the Book of Friends. If it is you in the previous life, nothing will happen. After reincarnation, you have lost the powerful spiritual power of the previous life. If you do not return your name before the age of twenty..."
Bandage Spirit (suddenly excited): "Will that make me die?"
Madara: "No, it's just that the demonic power in your friend's account can't be suppressed and bursts out in one breath, and then destroys your body over and over again and repairs it. The pain is more terrifying than Lingchi! And if you want to commit suicide, the demonic power will be restored and you will be unable to commit suicide."
Bandage Spirit: "Oh my god! How could such a terrible thing happen in the world! I've decided on the name, even the King of Heaven can't stop it, I said so!"
So a bandage spirit who loves suicide embarks on the road of returning the monster's name.
Note: The protagonist's previous life was just an imitation of Natsume's Book of Friends, not Natsume's Book of Friends.
Intention: I want to commit suicide but I still have to solve the problems left over from my previous life. Am I doing something wrong?