Backstabbed in a Backwater Dungeon: My Trusted Companions Tried to Kill Me, but Thanks to the Gift of an Unlimited Gacha I Got LVL 9999 Friends and Am Out for Revenge on My Former Party Members and the World is a Japanese light novel series written by Shisui Meikyō and illustrated by tef. The series started serialization on the online platform Shōsetsuka ni Narō in April 2020, and was later acquired by Hobby Japan for a print release in May 2021, with a manga adaptation by Takafumi Ōmae being published by Kodansha since May 2021. Both series were licensed for an English-language release, with J-Novel Club publishing the light novel series and Seven Seas Entertainment publishing the manga series. An anime television series adaptation produced by J.C.Staff aired from October to December 2025.