What are the subgenres of fiction?

Six years after having been sentenced to life imprisonment for the massacre of her entire village, Shun Shutsuki is recruited by the master of Gushiken Paranormal Organization and taken out of prison. Shun is the possessor of the Godai Shakujō, a hereditary ability of the Shutsuki Clan, which appears only once in several generations and manifests itself in the form of a powerful anti-monster weapon. According to Kagami Gushiken, the master of the Organization, Shun wasn’t herself during the massacre; she was possessed by a demon. However, this does not appear to be the entire truth; only Doctor Tsunan Hitachiin and the Master seem to know exactly what happened that fateful night. Evidently, the other members of the Organization are not at ease- to say the least- with the idea of having a “mass murderer” amongst them, with Tsunan’s fan-club being particularly averse to Shun’s presence within the organization. Even if monsters are absolutely real, none of them believe in the existence of demons and much less in demonic possession. Everything becomes complicated when Naoto Higaonna, an ex-member of the organization- who is now working as a high-school teacher- kills a group of students out of the blue before committing suicide. Things become even more complicated when the members of the Organization discover that Shun is constantly being hounded and persecuted by a certain Tadashi Honjō, with whom Shun seems to share a long-time bond. Who is Tadashi Honjō? Or rather, what is he? But, above it all, who is Subaru? What is Shun hiding so desperately? Will she be able to survive within the Organization? Will she return safely from the missions assigned to her?

there was a urban legend going around the town about a demon Mistress on the beach to everyone else that was scary but to Bing Ting it was fascinating that is what led to this Tale.

“When you see the red rose bloom, just know your fates are doomed.” In Ashvale, red roses don’t mean love. They mean someone’s going to disappear. No one knows who plants them. No one knows why they bloom. But everyone knows what comes next: silence, shadows… and loss. Years after a tragedy that fractured the town, a strange girl returns—quiet, watching, never quite belonging. And the roses grew. They kept growing… silently. Like a shadow. Some say the curse never left. Others believe it's only just begun. But one thing is certain: Ashvale is rotting from the inside out. And this time, the red won’t stop at petals.

Born a terrifying creature, Celestia tries to escape the path of murder destined for her to cross, while also avoiding her own death. A lending hand of Blaze secretly helps in protecting her, though this isn't the only thing he intends on doing.

Just your average succubus navigating through the world, that is until her sisters and brothers decide to start dropping dead and dear old dad wants her to protect her latest little bro.

Note: KonoSuba fan made volume 18.