Hero Syndrome Novel Volume 3 was written by Rei Ayatsuki with illustrations by riichu and Gekidan Inu Curry (Doroinu).

A week has passed since Kaguya fell unconscious. She's comatose, trapped within the psyche of a hero, and her condition continues to decline when news of the Director's death breaks. It isn't long before another hero appears, sparking a new battle for Charon. But Kaguya taught them that heroes can be saved—something that is not so easy to forget. Where did these heroes come from, and why must Charon keep fighting them? Having learned the truth, one young man must make a choice in order to end things once and for all…