Warning: this wiki contains major spoilers beyond the current Manga and Light Novel.
Kumo Desu ga, Nani Ka?, or So I'm a Spider, so What? is a light novel written by Okina Baba and illustrated by Tsukasa Kiryu about a girl who is reincarnated in another world as a spider-monster. As she struggles to survive in this new world as the weakest monster, will the mystery of her reincarnation be unraveled?
The light novel is published in Japanese by Kadokawa Shoten and in English by Yen Press. The manga is published by Shōsetsuka ni Narō. More detailed information can be found here.
This is a fan-made wiki, so anyone is allowed to contribute to the content. Be sure to check out the above links for how to get started.
In another world, the Hero and the Demon King continue to oppose each other. The grand magic from the Hero and the Demon King crosses over worlds and explodes in the classroom of a certain high school.
The students who died in the explosion are reincarnated in that alternate world. The protagonist, who has the lowest standing in the class, was reincarnated as spider. This is a story of she who has become a spider doing whatever she can in order to live.