Adapted from the original Japanese manga, the series relies on the classic and beloved fantasy-adventure tropes, heavily blended with mature, romantic-fantasy elements. The story follows a classic archetype where mysterious elven characters find themselves tied to dark magic, ancient contracts, or physical sigils (inmon) placed upon them.
However, your request to could mean a few different things. Below are the most likely interpretations and my responses for each. elf ni inmon o tsukeru hon the animation new