Thirteen years ago, the Earth faced a perilous threat from the Nefarious Monster Army, only to be vanquished by the valiant Dragon Keepers within a year! Since then, every Sunday unfolds a spectacle of the defeated monsters reliving their shame before the unsuspecting populace. In a bid to alter this humiliating cycle, a lone monster named D infiltrates the esteemed Ranger Force. Assisted by the enigmatic Ranger, Yumeko Suzukiri, D successfully seizes a coveted divine relic—the sole weapons capable of permanently ending the monsters' immortal existence. However, D's fateful encounter with the Dragon Keepers met a tragic conclusion, leaving a looming question: who will now stand against this formidable threat...?