Silence, an ordinary tuner with a huge debt, accidentally obtained the "Remnant Sound Collection System". The system allows him to collect key sound fragments from the past of a specific place or object. He originally wanted to use this ability to make some quick money, but when he was recording for a star, he accidentally collected a secret conversation from a recording pen that was not part of the recording content and revealed the truth about the "accidental" death of a rich man.
