When the Kougami Foundation discovered the mummified remains of Oda Nobunaga, they used a process to create a Cell Medal based homonculus of the warlord, with the original Nobunaga's memories stored into him. However, during his awakening he escapes from the Foundation scared and confused while beginning to attack descendants of major clans of the Sengoku period who arranged his death as an incomplete Armored Warrior Inhumanoid. He is then placed in Eiji Hino's care who shows him how much the world has changed without any knowledge on who he really is.