Go! Go! Loser Ranger!

Sentouin D, a Duster, leaves the Nefarious Monster Army's floating fortress in an attempt to change his fate as the weakest of his kind. Alongside the mysterious ranger Yumeko Suzukiri, Duster Sentouin discovers that the key to defeating the Dragon Keepers lies in their Divine Artifacts, which grant the rangers their unique powers. The Dragon Keepers, comprising heroes like Red Keeper Sousei Akabane, have been fighting imaginary enemies for 13 years to maintain their fame and prestige.