The fifth & final story is Act: V - Hollow Earth Arc.

Plot:
After the War is Finally over, Godzilla, Paimon & Kazuha go on adventures in Hollow Earth where they discovered their strange creatures but they have better be careful because the Tribes and Warbats are hunting them down, Meanwhile, on the surface, Aether and his friends along with Mothra went out to look for them but they have discovered that they went to Hollow Earth so they went to find them and rescue them.

The Protagonists reprise their appearance in the story. Archon Paimon will be added to Aether's Harem.

This story is inspired by the films: Avengers: Endgame & Journey to the Center of the Earth.

Let the story begin.