The plot centers on deception around Sieglinde Sullivan, a child prodigy gaslit into believing she is the Emerald Witch developing an ultimate spell (actually mustard gas), alongside standard series elements like demonic contracts, servant battles, and Victorian-era intrigue. No race, gender, or sexuality alterations appear for any established characters, and the new character Sieglinde Sullivan integrates organically as a manipulated prodigy rather than serving any identity-driven agenda. The narrative stays grounded in folklore deception, military conspiracy, and personal investigation without any framing around systemic oppression or identity politics.

The adaptation follows the original manga by Yana Toboso with no stated activist intent from the creator or studio. Minor fan service elements continue long-standing series traits instead of introducing new messaging, leaving the focus squarely on supernatural mystery and character-driven intrigue.