Sayo, the protagonist’s adopted sister, is torn from him during their youth when enemy soldiers abduct her, an event that fuels his relentless quest to find her across fractured, perilous lands. Their forced separation weaves a thread of unresolved grief and fierce loyalty into the narrative, anchoring the protagonist’s resolve.

Their eventual reunion sparks a transformation in their bond, evolving into a deeper, romantic connection that eclipses past alliances and flirtations. This shift marks a tonal pivot from confrontation to reconciliation, prioritizing emotional closure over vengeance.

Though separate from the central plot device—a fabled treasure unveiled as a cluster of women preserved in suspended animation—Sayo’s presence embodies the protagonist’s haunted past and the driving force behind his mission. Her role intertwines with his journey not through direct ties to the treasure, but as a living emblem of his buried wounds and enduring purpose.