After bringing peace to the world, the invincible Heroine is plagued by vivid, erotic nightmares that bleed into her waking life. She soon discovers she is trapped in a dream world orchestrated by a surviving demon commander, who employs a "level drain" curse to strip her of her power through forced pleasure. As her spirit breaks under the assault, the line between illusion and reality blurs, leaving her vulnerable and desperate.
Yuusha-chan awakens from a peaceful dream to a harrowing reality where she is imprisoned and stripped of her powers. Reduced to Level Zero via a cruel "Level Drain" mechanism, she is subjected to relentless abuse and used as a vessel to accumulate experience for the revival of the Demon King. Broken and devoid of will, the former hero is transformed into a mindless tool for her enemies' ambitions.