Link, an inconspicuous deck boy on the black sailboat "Sea Serpent", just wants to make a living. Unexpectedly, there will be a bloody rebellion on the new ship. Faced with the bloodthirsty first mate and the desperate captain, he relies on his pair of eyes that can see people's hearts and his incredible luck to quietly make plans amidst the lights and shadows of swords. When everyone thought he was just a lamb waiting to be slaughtered, Link backhandedly took the fate of the entire ship and everyone into his own hands. This sea, starting from tonight, will remember a new name.