Kumo Desu ga Nani ka manga AKA So I’m a Spider So What manga is probably one of the weirdest manga you will ever read.
Kumo desu ga nani ka manga which can be translated literally into English as ‘so I’m a spider, so what?’ is a Japanese light novel or manga which has also been converted into an anime.
In a very different world from our own, a battle between a demon lord and a hero results in the death of a classroom full of children because of a dimensional rift that is created.
Because of the nature of the event, all the children and teachers are reincarnated in a new and improved fantasy world where game stats rule everything. Most children in kumo desu ga nani ka are reincarnated as humans, however, some the less fortunate ones are reincarnated as monsters, which includes of MC who becomes a large spider, but decides to make the most of it.
If you’re looking for more info about the anime then you can from here.