The sisters consist of a cool and arrogant silver-haired elder daughter and a kind-hearted, innocent younger blonde. Initially, they look down upon the human boy and attempt to expel him from the forest. However, they soon fall victim to the "Book of Inmon," and the marks inscribed on their skin gradually break down their pride, forcibly heightening their sexual desires and transforming them into obedient, pleasure-driven servants.
: Given the title's reference to a book, there might be an educational component, possibly exploring themes of knowledge, power, and the importance of learning. elf ni inmon o tsukeru hon the animation verified
If this plan fits, I can:
Because the title is generic, multiple circles (authors) may have used similar phrasing. The most common suspect for the search is a work by a niche circle like Digital Lover (D.L. action), Zuttonto , or Shisakugan , but no single "famous" version exists under that exact name. The sisters consist of a cool and arrogant