RED -Shuumatsu no Outsider-

is a Japanese light novel series written by Akiga Nasaka, with illustrations by Kozo. The series began publication on March 10, 2016 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
An outsider boy who drives out a strange monster with his crimson right hand stands in the end world!

A world covered with brilliant spores that transforms humanity into a strange monster, Nightmare. Ioto, an outsider boy who keeps his reason and possesses special power while bathing in the light. The core on the right was responsible for the immortal regeneration ability and solved a number of missions.

However, due to his eccentric fighting behavior, he was glared at the upper level and was removed from the front line.

The new mission to Ioto was to escort the girl Minora, who is the key to treating Nightmare.