In a world built on the bones of ancient behemoths, humans have lost their sense of touch and can only perceive everything through bone resonance. Monster psychotherapist Alvin Skullsound is one of the few people who can communicate consciously with living giant beasts, and is dedicated to guarding these living history libraries. When the strange "fish rain" comes, indicating the abnormality and crisis of the giant beast "Wengshan", a "Rust Time Church" that believes in accelerating the decay of all things surfaces, intending to rust the giant beasts and civilization into ashes. Alvin must uncover the truth about the loss of touch in the world, face the ancient talent sleeping in his own blood, and in the race against the groan of bones and the rust of time, regain the final say and dignity for the dying beast civilization.
