The reader(evol rabbit) and his three brothers(evol dragon/robot/Crocodile) are seen battling Evol(his true form) and defeat him, but he uses the last of his power and the Pandora's box to create a vortex, so that they can never return to earth. They are pulled in, along with pandora box, which splits into panels, The reader takes two, William(Evol Crossz) takes two, and Merrill(Evol Grease) and Gage(Evol Rogue) each take one, and they all get pulled apart and land in different locations, or rather time periods(the singularities).

The reader lands in the Fuyuki singularity, William lands in the Orleans Singularity, while both Merrill and Gage land in the Septem Singularity. 

The reader saves Olga Marie by reversing the gate opening and storing her into a Empty Full Bottle, until they can find a way to restore her body(Humonculus body, so she'll be a child)

Y/n L/n
Kamen rider Evol Build
Forms: Evol Rabbit, Evol Tank, Evol RabbitTank Sparkling, Blackhole Evol Rabbit(looks like RabbitRabbit), and Blackhole Evol tank(looks like TankTank)
Pairing: Gudako, Mash, Olga Marie, Jeanne D'arc, Elizabeth Bathory, St. Martha, Frankenstein, Mordred, Boudica

William L/n
Kamen rider Evol Crossz
Forms: Evol Dragon, Evol Lock, Blackhole Evol Dragon(looks like Crossz magma)
Pairing: Kiyohime(shes a dragon)

Merrill L/n
Kamen rider Evol Grease
Forms: Evol Robot, Blackhole Evol Robot(looks like Grease blizzard), Evol Perfect Kingdom
Pairing: Ushiwakamaru

Gage Arthur
Kamen rider Evol Rogue
Forms: Evol Crocodile, Blackhole Evol Crocodile(looks like prime rogue)
Pairing: Atalanta