When Kalego Naberius, the ruthless professor of Babyls, finds a dying baby in the middle of a crater surrounded by demonic beasts, he never imagined that his act of mercy would change his destiny forever. To save her, Kalego asks his friend Balam Shichiro to use his own blood to stabilize her, triggering an impossible transformation in the girl. A story of found family, dangerous secrets, and the slow bond between an iron demon and a creature that should never have existed in Hell. Can Kalego protect the daughter he never asked for?

In a forgotten village on the borders of the Land of Fire, Team 7, under Yamato's temporary command, investigates troubling rumors: bodies marked with Orochimaru's cursed seals and something that has escaped from his experiments. What they find is not a weapon, nor an enemy... but something far more dangerous... for Yamato.