Months have passed since Kamen Rider Birthright defeated the Over Quartzer along with his Titan Guardian Athar. Now Percy decides to travel back to America along with his girlfriend Ryuko and her friends to celebrate Halloween. Unbeknownst to them...
(Ryuko, Percy, Satsuki, the Elite Four and the Makanshoku Family are seen in an airport.)
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Percy: Ah, it's good to be back to America.
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Ryuko: So this is America.
Satsuki: Doesn't look like a big deal.
Percy: Believe it, Satsuki. The United States are one of the world's biggest potencies.
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Mako: I heard that a waifu can't be shot ever since Barack Obama became a president.
Mataro: Did you watch Kakyoin's Waifu Conossieur lately?
Barazo: I heard it's a spooky month.
Sukuyo: Spooky month?
(Barazo and Sukuyo start doing the Spooky Month Dance.)
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(Everyone gets dumbfounded by that.)
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Gamagori: Uh... whatever...
Uzu: So? Why are we here again?
Hoka: Well, I got some intel about some supernatural activities that happened lately.
Nonon: Oh, I like hunting supernatural threats.
(Suddenly a certain gremlin comes in.)
Percy: Watch out!
Satsuki: (draws her sword) Battle stations!
(Everyone gets in their fighting stances as James approaches them.)
James: Percy Howard... I require your assistance.
(Ryuko and Satsuki don't listen, and try to charge at him, but he defends himself as Gamagori charges at him and tries to punch him, but he counters with a metal punch.)
James: Please, I didn't come to fight. Please, listen to what I have to say.
(Everyone looks at each other as both Ryuko and Satsuki nod at each other.)
Hoka: Something unusual is happening here.
James: Yes, turns out Ragyo Kiryuin revived Samhain the Halloween Overlord.
(Everyone gets shocked by hearing this.)
James: He was brought to life after being killed by his adoptive stepson John Proctor II. And now, he transformed all of the Halloween costumes and decorations into living creatures.
(They think for a moment, and decide to help James.)
(Unbeknownst to them, a young boy is watching them from afar.)
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????: Looks like that bastard Luis is back... I'd better do something about it... and fast.
