Since I can’t locate an existing article for it in my knowledge base, because that would essentially invent fake information about a book that might not exist.
Volume 1 dedicates significant "page count" to the ritualistic preparation. The protagonist must gather rare ingredients: moon-drop nectar, ironwood thorns, and a specific catalyst (often the elf’s own blood). The marking process is described in pseudo-occult detail: elf ni inmon o tsukeru hon 1