darkness of the blood

the peaceful province of Kurogane, Lord Kazuma is revered as a wise and merciful ruler. To his timid, fragile son, Ryuma, Kazuma is simply a revered father. But Ryuma is plagued by horrifying nightmares-flames, rain, blood on his tongue, and a blade driving through his back.
Driven by phantom whispers, Ryuma unearths ancient relics hidden beneath a ruined shrine: a black katana and samurai armor pulsing with forbidden hellfire. As he touches them, dark memories erupt into his mind. He is not just Kazuma's son. He is the reincarnation of an unstoppable conqueror-murdered, betrayed, and robbed of his empire and his beloved wife, Hana, by his own envious brother.
Twisted by a blood oath with the High Demon Gouen-ou, Ryuma must navigate his fading humanity and unleash an ancient vengeance against the man who claims to be his father. But Kazuma harbors his own terrifying demon pact-and he will destroy everything to keep his stolen crown.