Elven Blood

is a Japanese light novel series written by Fujiwara Yu, with illustrations by Kata Konayama. The series began publication on February 10, 2015 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
A human sibling who lives in a remote village and an elf brother and sister who live deep in the forest. Their peace, as close friends, should have lasted forever.

However, suddenly the elf side begins an invasion operation into the human world. It tears the feelings of the four people and makes a mistake. Eventually, a human boy-Imina stands on the battlefield with an elf girl-Eris. The sword he carries is crimson.

It used to be the same color as the one that was flowing and will be flowing

... A dark fantasy filled with painful fresh blood, opening here!