Guts the Black Swordsman has again donned the accursed Berserker armor, and he'll need all its unholy power to battle the titanic Sea God - from the inside! As the creature takes on an army of beautiful merrow, Guts plunges deep within the God to find its sole vulnerability and pierce its living heart. But even if he can manage this impossible task deep within the leviathan, how will Guts get back out?