I, the protagonist, was just an ordinary high school girl, but suddenly I was reincarnated as a spider monster in a fantasy world. Not only that, but I awakened in a dungeon filled with vicious monsters. Armed with only my human knowledge and my overwhelming positivity, I’m forced to use spiderwebs and traps to defeat far stronger monsters just to stay alive… So begins the labyrinth survival story of a girl with incredible mental strength living as one of the lowest-ranked beasts!The world where the Hero and the Demon King continue to oppose each other. The grand magic from the Hero and the Demon King cross over worlds and exploded in the classroom of a certain high school. The students who died in the explosion will be reincarnated in a different world. The protagonist, who has the lowest reputation in the class, was reincarnated into a spider. Nevertheless, she adapted quickly to the present condition with strong willpower. This is a story of she who has become a spider trying whatever she can to live.