[Jinnai] Mahou no Kikai (Magic Machine) [Kuraudo]

A defiant elf warrior wakes in chains inside a dungeon of hissing pipes and skull-festooned machinery, her only thought whether her little sister escaped the townspeople who branded her a savage. Her hooded, plague-masked captors reveal the truth behind the elves' disappearances: their magic is the fuel that powers humanity's magic machines, and they intend to extract it from her trembling body with stiff-bristled brushes and pistoning devices until she surrenders her village's location. She spits curses through every forced climax, clinging to her promise to find her sister and go home together, but the machines show no mercy and her resolve is starting to break.