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In 1999, chaos reigns. Captain Takayama Kai commands a massive ship carrying the hope of justice, while he seeks to find his missing brother, Takayama Rin, from whom he has been separated since childhood. Little does he know, his brother has turned to darkness. Over time, a dangerous and infamous gang called the "Skull Gang" emerges—a group of outcast criminals, each with a dark past, who have become brothers under the wing of their leader. Every moment reveals a new aspect of their dark past, and a close encounter between the brothers threatens to expose secrets and ignite war.