Recaps

Leng and Heroson helped humans and benevolent Orphnochs overthrow Brain Company and begin building coexistence. After Umbrella studied the captured technology, a rift opened above Mars and its forces entered Hell to hunt demons and find the Doom Slayer.

• Arthur and Yan agreed to cooperation with the angels, and Leng became Heroson's mentor after receiving a Fourth Generation Body and Sub-biological Engine.
• William sent Leng, Heroson, and Umbrella forces through a passage to the Kamen Rider 555 universe, where they rescued human survivors and made plans to seize Brain Company's Emperor Belts.
• Leng and Evreny helped the Human Liberation Army recruit benevolent Orphnochs, recover weapons, and prepare Leo Rider Belts for an assault on Brain Company.
• The allied humans and Orphnochs defeated Brain Company's forces, took its headquarters, and installed Kiba and his allies as leaders while Umbrella secured the surviving humans and began promoting coexistence.
• William tested the new Upsilon belt against Serena's Kaiser, then designated the Leo Belt as an exclusive weapon for the Ghost Agents.
• When a rift appeared above Mars, William, Serena, Heroson, Leng, Queen, and Umbrella's forces entered Hell to fight demons, search for the Doom Slayer, and find a way to close the rift.