A premium black tuna worth 15,000 yen per kilo! This magnificent specimen boasts a lustrous, diamond-like black sheen and exceptional freshness. However, it has the surprising trait of being uncooperative. Witness the rare black tuna, available only in Tokyo, as a mistaken parent-child duo takes on the challenge of conquering it. Find out how the showdown between the two unfolds and discover the true sound this black tuna makes.