In Osaka in 1997, Morishima High School transfer student Asano Aoi heard the sound of a bloody piano at dusk. Yanaghara Yukimi, a girl carrying a worn-out guitar case, always disappears when the strings tremble - the bully drowned in the piano case with ten centimeters of water, the experimental assistant was strangled by long hair in the ventilation duct, and the tormentor's blood vessels burst into staves. When Yukimi handed over lemon candies soaked in medicinal fragrance, Asano's synesthesia suddenly saw the concrete death track of sound: the electromagnetic coil in the piano box, the resonant metal piece in the skull of the missing person, and the military frequency recording left at the scene of the mass suicide three years ago.
The scalpel left by his father cuts open the fake ornaments, the school janitor's calloused hands, the nitroglycerin crystals on the bottom of the lunch box, and the weird sound wave patterns in the video of his brother's death all point to the secret deep in the modified guitar. On a rainy night, Asano witnessed Xuejian embed a titanium alloy piano into the temple of the deceased at the observatory. The bloody finger marks of his younger brother's death appeared on the glass of the old school building amidst the roar of the piano. The military music sheet from the Showa era handed over by the wandering musician clearly recorded the human experimental data of sonic weapons.
Concept: When sound becomes a tool of torture, the last person to hear the truth must make a choice in the Revenge Concerto: to be a silent tuning fork, or to become an out-of-tune string.