A mysterious swarm of meteorites is approaching the earth, and SOLU, the seed of life in the universe that comes with it, has become the coveted target of the dark enterprise, Consortium X.

In order to prevent Consortium

On the other hand, the meteorites caused the distortion of time and space, and then brought Kamen Rider Poseidon 40 years later to the current world.

The bellicose Poseidon is eager to show off with Kamen Rider OOO and Birth.

In order to clean up the mess, the Kogami Foundation urgently recalled Hino Eiji (OOO), Goto Shintaro (Birth) and Ida Akira (Birth), who had already returned to normal lives.

The meteorite swarm caused a series of troublesome events, and Carnage, a cadre of Consortium X, rebelled against the organization and monopolized the astronomical switch related to the destiny of the present and the future, preparing to realize his arrogant ambition to dominate the galaxy.

In order to thwart Carnage's conspiracy, Kamen Rider W, OOO, and Fourze teamed up to attack Carnage and his army of monsters. Even Kamen Rider Aqua 40 years later joined the battle.