Running a search on DLsite for "エルフ 淫紋 アニメ" returns as of this verification. A search for general "淫紋 アニメ" returns about 6 items, none of which are elf-focused.
🌟 🌟 The long‑awaited anime adaptation of “Elf ni Inmon o Tsukeru Hon” has just been officially verified ! 🎬✨ elf ni inmon o tsukeru hon the animation verified
If — hypothetically — an animation existed, it would be on: Running a search on DLsite for "エルフ 淫紋
Week 3 — Comparative Narrative Analysis elf ni inmon o tsukeru hon the animation verified
To help you find exactly what you're looking for, I can look into: names and their legal storefronts. The release dates for specific episodes or volumes. Technical specs of the official Blu-ray/Digital releases.