After a hellish battle against ravenous sea monsters, Guts the Black Swordsman and his companions are forced to seek refuge on a small island so that their ship can be repaired.

After a hellish battle against ravenous sea monsters, Guts the Black Swordsman and his companions are forced to seek refuge on a small island so that their ship can be repaired.

But this island is not the safe haven they'd hoped for - it's a sinister place rife with dark energy, watched over by an ancient, vengeful god. And with a full moon on the rise, that god's power is about to be unleashed...