Go! Go! Loser Ranger!, also known as Ranger Reject, is a Japanese manga series written and illustrated by Negi Haruba. It has been serialized in Kodansha’s Weekly Shonen Magazine since February 2021, with its chapters collected in fifteen tankobon volumes as of July 2024. An anime television series adaptation produced by Yostar Pictures aired from April to June 2024. A second season is set to premiere in 2025.