One day, a white-haired boy of unknown origin became a guest of the Demon Slayer Corps. According to an unnamed victim, Mr. Ghost, the young man's swordsmanship was extremely superb, and he could be defeated in seconds with just one move.
In addition, he also has extremely powerful abilities. How powerful is it? Let's put it this way: A certain unnamed Mr. Ghost, the second victim, said that I was going to bite the person to death after all my hard work. When he came and touched me, all the wounds I finally bitten were healed. What's more, the members of the Demon Slayer Corps watched him cure their master's disease, but the person involved still didn't think so...
Note: The protagonist is in poor health, the reason will be explained later.
The Cp has not yet been decided, so let's write it down first.
Intention: I love Demon Slayer!