In Stray Incubus - Season 2, during a fierce conflict between races, valiant warriors backed by the gods eliminate a dark race of demons. However, one warrior shows unexpected mercy, sparing a lone demon child. Rather than ending his life, she chooses to raise him as her own. Years pass, and the incubus matures into adulthood, now yearning to embark on an adventure of his own, eager to discover the world beyond his upbringing.