Synopsis

In a distant past, an epic war engulfed all kingdoms of the earth, pitting them against the malevolent Dark Army of Deads. The devastation was unparalleled as half of the earth's population and 107 kingdoms succumbed into dust. But amidst the chaos, the legendary King Minamoto, the sole wielder of the Wrath of Dark Fire, made the ultimate sacrifice. Drawing upon his clan's immense power, he unleashed a self-destructive move that annihilated the Dark Army and his own kingdom. The Minamoto clan, renowned for their devastating wrath, perished, leaving behind only four heirs - Ukichi, Kageru, Uzin, and the only son of the king Minamoto , Hiroto Minamoto.

As time passed, the heirs grew, but an unforeseen consequence left them without any wrath, weakening their once formidable legacy. Residing in the Sugiayama kingdom, they became an assassin squad. Yet, whispers spread that the Dark Army might rise again, targeting the surviving Minamoto heirs. But heirs of Minamoto was Determined to prove themselves and honor their fallen king, the Last Heirs embarked on a perilous journey to become the most powerful assassins of all time.

Their path was strewn with challenges, sacrifices, and profound pain. Branded as the Failed Minamoto's, they faced a world where wrath was the key to respect and power. Could they rise above their inherited limitations, survive the impending threat of the Dark Army, and surpass the greatness of their fallen king? Their destiny hung in the balance as they aspired to become the true heirs of Minamoto, forging a legacy that would shape the fate of the world.