After Noah and Zagi's battle, Zagi transmigrates to a parallel Earth and takes on the identity of Lin Yu. Following his battle with Lucifer and Beelzebub, Noah is gravely wounded and comes to Earth in pursuit of the two, who are also badly injured.
Ling Yu gains the power of Nexus. As he grows stronger while constantly doubting himself, he learns to stand firm in his convictions. Later, he dies in battle against Mephisto.
Lin Yu, who transmigrated from another world, merges with Ling Yu, who is on the verge of death. Noah and Zagi officially become one. Later, Lin Yu takes on the form of Nexus to fight, but dies battling the third-generation Mephisto, Raphael Mephisto.
As he is about to die, Zagi's power runs wild. The light in humanity's hearts bursts forth, and Tiga appears.
The arrival of Lucifer and Beelzebub leads Lin Yu to embrace the light amid the darkness! In the end, Noah faces his own dark side instead of trying to separate it from himself, and awakens the Noah Chaos Form.
At last, he defeats Beelzebub and Lucifer, absorbing their power. Humanity's light shines bright, and Tiga merges with Noah, giving birth to the Noah Eternal Form!
