Taima no Reikoku ~Zettou no Kaizou Inju Choukyou~ The Motion Anime

The dark fantasy narrative follows Tokika, a skilled exorcist who infiltrates the treacherous demon stronghold of Onigashima, only to trigger a sinister magic formation and find herself completely trapped. Held captive by the youkai horde, she is forcibly exposed to potent corrupting aphrodisiacs and branded with dark seals that permanently alter and reconstruct her body beyond the reach of any antidote or dispelling ritual. Broken into absolute submission toward the enemies she once despised, the transformed Tokika endures relentless assaults by legions of demonic entities, as the invasive corruption slowly ensnares her mind, defiles her soul, and locks her into a state of perpetual carnal servitude.