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...
(Kamen Rider Hallowright is seen preparing to face Samhain as two certain groups come out. One is Yuri Ikari aka Kamen Rider Black Sun (the Prince of Daikaiju-Verse), Zane Johnson aka Kamen Rider Dai, and his Inner Devil named Kaiju, aka Kamen Rider DaiKaiju.)
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Black Sun: I am the offspring of the sun. Kamen Rider Black Sun!
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Dai: We're here not only to celebrate Halloween, but also celebrate our master's birthday.
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Kaiju: WHOOHOO! I WANT CANDIES!
(Dai bonks Kaiju's head.)
Dai: Not now, Kaiju. (sighs) Sorry, Percy. Kaiju is such a troublesome partner.
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