Bell Unlocker: the Last Feast

The contemporary real world, but secretly there is a foreign society composed of "awakened people". They are called "Thread Observers" or "Bell Unlockers". They can see the "causal threads" invisible to ordinary people, and perceive the regrets, obsessions and pain that haunt people's hearts. These strangers are hidden among ordinary people and live in various identities - shadow puppet masters, musical instruments, funeral home staff, psychological counselors, temple monks... They secretly deal with the entanglements of cause and effect that are "unexplainable by science" and maintain the delicate balance of the world. Ordinary people know nothing about them, and the occasional "supernatural incident" is just the tip of the iceberg of their work. When the world kisses you with pain, do you choose to repay it with resentment, or repay it with a song, even if the song is sung with your life?