Go! Go! Loser Ranger!, also known as Ranger Reject, is a Japanese manga series written and illustrated by Negi Haruba. Set in a world where a once‑defeated alien invader force is compelled to stage weekly “Sunday Showdown” battles against the Dragon Keepers, the story follows a disillusioned foot soldier who plots to upend the status quo. Featuring themes of justice, corruption, and the blurred lines between heroes and villains, the series combines action‑packed Sentai homage with satirical twists on hero tropes, offering both thrilling battles and sharp social commentary.