(Spin-off of Conclusion to be a Vigilante.)
Isurugi Midoriya, Sougo Todoroki, Ori Uraraka and Mika Yaoyorozu witnessed the evil brought by Union Academy, and decided to join the Desire Grand Prix to fight both students and staff to save the world fr...
(After successfully rescuing Chihiro and destroying Tartarus, freeing several prisoners, the F4 Riders are reverted to their normal selves while PunkJack still remains in his rider form.)
Chihiro: (smiles) I knew you'd be back to me, Isurugi.
Isurugi: I'm glad to see you too, Chihiro.
(Tsumuri comes in.)
Tsumuri: You did a great job, especially you, PunkJack.
PunkJack: Thank you, Tsumuri.
Sougo: Since when did you have the title of "The Traitor of Union"?
PunkJack: I'd rather save this question for later.
(While the F4 Riders start keep talking with PunkJack, Tsumuri hands a Desire Driver and an ID Core to Chihiro.)
Tsumuri: From now on, you will be known as Kamen Rider Seeker.
Chihiro: (nods) Well, I have a debt with you and your team. So... I accept to become a Kamen Rider.
(Suddenly the alarm goes off, and Tsumuri clicks a button, showing a footage of a large number of Jyamato land in the city with a Jyamato Fortress.)
Tsumuri: The Jyamato started a full scale invasion.
(She then hands the Boost Buckles to the F4 Riders and PunkJack.)
Tsumuri: You're gonna need these.
F4/PunkJack: (nod) Understood.
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POWERED BUILDER BUCKLE!
SET!
SET WARNING!
F4/Chihiro: Henshin!
DUAL ON!
GET READY FOR BOOST & MAGNUM!
NINJA & BOOST!
BEAT & BOOST!
ZOMBIE & BOOST!
MONSTER & BOOST!
WOULD YOU LIKE A CUSTOM SELECTION?
READY, FIGHT!
(Timeskip)
(The Jyamato and the Jyamato Fortress keep attacking innocent people until the F4 Riders, PunkJack and Seeker come in.)
Tycoon: Time to test your luck.
Geats: Now, here comes the highlight!
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