In a final battle that claimed them both, the mightiest of heroes, “Gelong”, perished alongside the Demon Lord. Five years later, he is reborn—only to awaken in the heart of his enemies’ domain, his soul now inhabiting the frail body of a lowly demon. But an unforeseen power stirs within this feeble vessel, ignited by his very soul: the ancient evolutionary might of the Serpent God. Gelong, a man once renowned for a ferocity that surpassed the demons themselves—what seas of blood will he now ignite with a truly demonic body?

In a world shrouded in darkness, where demons run rampant, a young man named Hisago Harukawa, once forced into committing crimes under the threats of demons, sets his sights on his next target: a suspicious woman who calls herself Darwin, proponent of “Evolution.” But this encounter changes everything, Hisago is pulled into a battle to send demons back to the depths of hell. To survive, he must evolve. A devil-hunting fantasy of atonement begins.

March proudly into the meatgrinder. You are the Chosen Ones. The continent is trapped behind an impenetrable wall of a million ruthless monsters. The ruling Noblesse claim only the grey-haired 'Omnirift' population can awaken to save humanity—forcing them into brutal, endless military quotas. It is the perfect lie to systematically wipe out the Omnirift bloodline. Ash is one of the omnirift people, but a special one. So what secrets lie behind him?

University student Mimi Usazaki spends her days battling depression while attending psychiatric sessions and muddling through a bleak college life. One fateful day, she's caught up in a mysterious experiment that alters her life forever. Through the experiment, she ends up hosting the consciousness of Hyou Usazaki—her estranged younger brother, who also happens to be a death row inmate. Now, Mimi finds herself thrust into a deadly struggle against other death row inmates who were subjected to the same experiment. Will she survive the chaos that ensues? Or will her connection to her brother bring about her downfall?