Kazan is introduced as a soldier serving Yuuki Momose within the Otherworld King’s forces during the Grand Rolo conflict. His unwavering loyalty stems from Yuuki’s uncanny resemblance to his former captain, a bond driving his dedication even as Yuuki opposes the core soldiers. This allegiance casts Kazan as an early antagonist, including his involvement in raids like the attack on Zungurii’s village.

When Yuuki defects to ally with the protagonists, Kazan mirrors this shift, redirecting his fidelity to their cause. His combat prowess and strategic mind prove vital to the group, underscoring his capacity to navigate shifting allegiances.

In the sequel, Kazan rises to command forces battling the mazoku, a species threatening humanity’s survival. Subtle implications hint at a shrouded past as a time traveler from the future, though his origins remain undisclosed. His persistent role in the conflict highlights his resolve to protect Grand Rolo, intertwining with themes of loyalty and redemption.