Not Normal Tea Party

What does it feel like to be swallowed by darkness? It's painful, as if it's been corroded Can't feel like I'm alive He signed a contract with something called the [Holy Grail], which looked like it was filled with black mud. The other party asks for malicious points to be collected and given to him, and he will give him what he wants. Like changing the shell or something? He smiled and replied "Okay" Anyway, I didn't say who collected it, you can just pour the black mud yourself. So the young man began to wander around the world wearing various identities. ——[The detective who is highly respected by the other world and can be called Moriarty] [The ordinary detective agency member who is like Black Mud himself and his sister with super powers] [Former math teacher of the great commander of the five devastations of heaven and earth who often skipped work] [The great president who directly rejected Sanji's idea and became the leader of Port Mafia, the upright party] [Without emotions, it's like a walking dead. Both civil and military cultivators are a brother-controlled gravity user] [He is not very upright and refuses to save the world, but instead leads the rebellion of the Judaiime] and so on So—— "Are you ready?" Notes for this article: 1. It can be seen as separate short stories. No one will remember the two worlds except the protagonist. 2. Used for pouring black mud. If you feel uncomfortable, exit immediately. 3. Welcome to provide ideas w Concept: black mud