I'm a Monster, So What's Wrong With Eating People?

[Villainess Heroine + No Romance + Yandere + Dark Cannibalism] Content warning: extreme content, attraction to both men and women, unrelentingly dark. Readers who can't handle it should stay away... It was originally just an inconspicuous little spider, spending every day on the web it had woven, waiting to catch small bugs so it could barely fill its stomach. * However, one day, the little spider accidentally devoured a mysterious woman. From then on, it gained intelligence and became a monster. In this vast world, the human and monster clans had always been bitter enemies, their battles and slaughter never-ending. It wasn't until they discovered that demons were invading that the powerful figures of both clans had to put aside their grudges for the time being and join forces to wield supreme magic, setting up a barrier that split the world in two. Thus, the Human Realm and the Monster Realm came to be. But some monsters were very cunning. They found a weakness in the barrier and secretly slipped into human territory, throwing the mortal world into chaos.