Nezha went to the East China Sea to attend the Dragon King's birthday banquet, but unexpectedly discovered that the dragon clan was being monitored by the sky rail system, and the strange movements in the ruins hid a shocking secret. In the process of searching for the truth, Nezha and Ao Bing work hand in hand to uncover the seal of the ancient blood contract and the dark conspiracy of heaven.
They encounter a mysterious attack, face the imprisoned Ying Long, go deep into the fissure of Guixu, bravely break into the center of heaven, and fight to the death with the evil power of heaven. The spiritual beads in Nezha's body resonate with the fragments of the Yin-Yang Mirror, while the heart-eating poison in Ao Bing's body sticks to justice.
In the crisis-ridden battle, they continuously awakened powerful powers, united with the water tribe allies, and went through countless hardships and obstacles, finally breaking the confinement of the heaven, saving the dragon tribe, and reviving the aura of the three realms. However, a new journey has just begun. Mysterious places, unknown crises, and ancient ruins are waiting for them to continue exploring and write their eternal legend.