While fighting with a demon, Azel is captured and fucked silly. After managing to escape she notices that a Crest engraved by the demon is left on her abdomen, a crest that causes insatiable sexual desire…
Niplheim no Karyuudo: Branded Azel 1

After a fierce battle with a demon, Azel is overpowered and taken captive, subjected to relentless pleasure until she’s left dazed and breathless. Escaping at last, she discovers an ominous Crest burned into her skin—fueling an endless hunger for ecstasy. The mark stirs irresistible urges, tormenting her body with waves of desperate need, as she struggles against its cruel, seductive grip, torn between resistance and surrender to the demon’s dark temptation.