Adam, known as "Who," emerges from a reimagined Judeo-Christian mythos as the biblical first man. His towering stature and flamboyant, stylized blond hairdo establish a striking visual presence, outshining other figures in both height and distinctiveness. The narrative entwines his existence with the cyclical struggle of human souls, reincarnation, and duality, positioning him as a linchpin in Hell’s origins. This infernal realm arises as a psychological construct shaped by his son Abel’s vengeful grudge against humanity; operating under the alias Ryu Kutou, Abel weaponizes belief systems to sustain Hell as a prison for guilt-ridden souls. Adam’s other son, Cain, adopts the mantle of Hellvis, merging scriptural archetypes with pop-cultural flair.

Adam’s legacy converges with protagonist Rinne Amagane, the reincarnated Eve, anchoring the story’s exploration of recurring destinies. Rinne’s odyssey through Hell mirrors primordial human history, reflecting Adam’s enduring influence as his sons’ conflict reshapes the afterlife’s hierarchy. The narrative climax sees Rinne returning to the living world stripped of her infernal memories, though faint echoes linger in her lineage, hinting at unresolved ties to Adam and Eve. His role remains pivotal, anchoring the tale’s metaphysical framework and moral tensions while bridging ancient myth with Rinne’s transformative journey.