As the Igarashis face an eviction notice and the potential loss of their sento due to city renovations, Daiji visits his hospitalized mother, Yukimi, for advice.
Ikki successfully rescues Sakura and Ayaka from a Deadman, only to learn their kidnapper is not in possession of the corresponding Vistamp, forcing him and Vice to find it before it causes more trouble.
To celebrate Yukimi being discharged from the hospital, the Igarashis take a trip to a hot spring resort. Upon arriving however, they learn that their regular customers, the Ushijima family, are also there.
After Sakura awakens her inner demon instead of becoming a Kamen Rider and Ikki is injured while protecting her, Daiji demands she hand over her Rider equipment to Fenix so they can investigate the person who sent them.
Fenix is forced to land their mobile headquarters, the Sky Base, in order to refuel, restock on supplies, and give several of their operatives, such as Kadota, time off.
Wakabayashi is suspected of being a traitor and the contract holder connected to the Chameleon Deadman. In spite of Daiji and Kadota's shock, Karizaki decides to set a trap for the Deadman to confirm.
A shocked Aguilera discovers she is intended to become a sacrifice for Giff's revival instead of his bride, which her right hand Orteca knew about and withheld from her while her bodyguard Julio becomes livid over the revelation.
Deadmans' attack has been thwarted, but Aguilera and Julio are on the run together while Orteca and the Chameleon Deadman move forward with their own plans.
Upon learning Deadmans can use the Giff Stamp to sacrifice humans and turn them into Gifftarian Deadmen, Ikki strengthens his resolve to avert Giff's revival.
After Kamen Rider Revice successfully masters the Volcano Rex Vistamp's power and develop the ability to separate Gifftex Deadmen from their human hosts while restoring Julio's humanity, Orteca grows worried over the latter prospect and begins to target Kadota.
After Yamagiri is revealed to be a traitor when she discovered dubious operations within Fenix, Kadota's condition grows worse as he starts hearing his Demons Driver telling him it will devour him.
Ikki and Vice rescue Kadota from the Demons Driver, but he chooses to resign from Fenix due to his fluctuating emotions and wavering loyalty to the organization; Fenix has captured Orteca, who has been separated from his Deadman form.
Following a mishap with the unsanctioned Rolling Vistamp, Ikki and Vice switch corporeal states. Overjoyed by his new state of being, the latter goes rogue to destroy the Vistamp and make the switch permanent.
Following Kagero's testimony regarding Fenix and Giff, George decides to investigate them once more while helping Ikki and Vice reverse the Rolling Vistamp's side effects.
Following Genta Igarashi's sudden transformation into Kamen Rider Vail, Igarashi siblings discovers they are Giff's descendants by birth through their father.
Following Genta Igarashi's sudden transformation into Kamen Rider Vail, the Igarashi siblings discover they are Giff's descendants through their father as their inner demons' connection to the original demon grows stronger.
Akaishi reveals Julio, Orteca, and Aguilera are test subjects used by Noah, a group of criminal scientists who seek to use Giff's cells to turn humans into demons, and that he has been using Fenix to transform its soldiers into demons.
After Sakura joined Weekend, she and Tamaki encounter Aguilera as she finally resurfaces after being forsaken by Giff. But Aguilera is acting strange as she attacks Sakura.
As Lovekov suddenly becomes unresponsive to Sakura's commands, the latter must re-learn her missing motivation before freeing Aguilera from her Deadman form.
After Aguilera joins Weekend and gains Sakura's friendship after her humanity is restored, the Igarashi siblings regroup with their allies to stop Akaishi from increasing Giff's power and save Akemi.
The Igarashi siblings, George, and Weekend must re-coordinate their plan to save Akemi, who has fallen into darkness, and prevent Akaishi from announcing his plan to bring about a demon apocalypse on Earth.
In response to Giff's full scale invasion of Earth and Fenix's failed demon removal stamps, Weekend publicly reveals themselves to the world and urges civilians to rebel against Akaishi and his lies, despite the risk.
Shortly after Akaishi murders Akemi, the Karizakis struggle to create a new Vistamp to counter the revived Giff until Genta confronts his children before allowing himself to be used in the creation of the Giffard Rex Vistamp for Revice.
With Genta surviving a cell transfusion surgery, the Karizakis create the Giffard Rex Vistamp, which Ikki and Vice use to become Kamen Rider Ultimate Revice and give humanity hope and inspire citizens to either join Weekend in fighting Giff's tyranny or build shelters across the city. Furious, Akaishi begins his plot to invade Weekend's base.
Because of Daiji's stubbornness went to the path of devil, Weekend marked him as an enemy in retaliation for betraying his own allies and families who opposes the demon.
After receiving a modified Vail Driver from George, Genta intends to settle the score with a weakened Vail by transforming into Kamen Rider Destream and facing the demon in combat.
While Genta and Vail reconcile with each other following their battle, and Daiji were about to rejoin his family at the same time, Giff revives Akaishi as a Gigademos.
While Hikaru successfully defeats Akaishi and avenges Kimiko and Tasuke, he is unable to kill him due to the Over Demons system taking a heavy toll on him.
While Vice mentally struggles against Giff, the heroes learn that defeating Giff's demons and freeing the previous victims who were used for the demon's revival spreads his parasites at a faster rate.
After barely escaping from Juuga, the Igarashi siblings learns from Hiromi the truth that he discovered behind the recently fallen scientist's rampage.
After George is freed from Chic's control, Ikki has forgotten all memories of his family and goes to pursue a normal life. However, a corrupted Vice arises as a new threat.
What seemed to be Vice betraying Ikki, turns out to be his way of attempting to restore Ikki's memories. However, the restoration of Ikki's memories would mean voiding the contract between the two.
