After the decisive battle against Hades in the Underworld, Pegasus Seiya is left at death's door after having his chest pierced by the Underworld God's cursed sword. The curse gradually drains his life force, leaving him with only three days to live. Determined to save her Saint at any cost, the Goddess Athena (Saori Kido) and Andromeda Shun turn to the God of Time, Chronos. Saori's goal is to travel 243 years into the past—to the era of the previous Holy War—to destroy Hades' sword before it can even wound Seiya.