During his childhood, Lyon Bardot witnessed his parents die during the battle between heroes and villains. He was then adopted by the Midoriya Family and became supportive towards Izuku and his dream to be a hero. During the Sludge Villain incident...
(Spade Ace, Lincoln/Decade, Tokuro/Diend, Alex/Dark Decade, Demons, Mulkiewicz, Cervix, Zach and Invincible are seen ready to chase after Yamato, who prepares to transform.)
Yamato: Henshin!
Buckle: Open Up!
(Yamato becomes Kamen Rider Glaive as he keeps running from the heroes. They get a call from Kingpin.)
Kingpin (via codec): Guys, get Glaive! Do not lose him this time!
Lincoln/Decade: Don't worry. We won't.
(The nine heroes go upstairs and proceed through the corridors until they reach the heliport, where Kamen Rider Glaive is seen waiting for them.)
Glaive: How's this, heroes? We can play up here without damaging the merchandise.
Spade Ace: What happens in three hours?
Glaive: (laughs) Don't matter, you're too late. Even at Mach 2 none of you would make it. And killing you all is gonna take some time: slow, and painful.
(Two helicopters come in and Glaive turns on his six-segment shield.)
Glaive: Like I said, kids are cruel, heroes. And I'm very in touch with my inner child.
(Glaive takes out his two sword shears and laughs maniacally.)
Alex/Dark Decade: You want cruel kids? We'll give you one!
(Decade, Diend and Dark Decade draw out their K-Touch 21.)
Decade K-Touch 21: Double, OOO, Fourze, Wizard, Gaim, Drive, Ghost, Ex-Aid, Build, Zi-O, Zero-One. Final Kamen Ride: Decade Complete 21!
Diend K-Touch 20: Accel, Birth, Meteor, Beast, Baron, Mach, Specter, Brave, Cross-Z, Geiz, Vulcan. Final Kamen Ride: Diend Complete 20!
D. Decade K-Touch 21: Eternal, Poseidon, Sorcerer, Mars, Dark Drive, Dark Ghost, Fuuma, Blood, Barlcxs, Eden. Final Kamen Ride: Dark Decade Complete 20!
(The three change to their complete forms, and Glaive gets in his fighting stance.)
Glaive: You can be crueler than that, boys.
(Glaive uses his shields and charges at the heroes. Spade Ace's weapon clashes with them and Lincoln/Decade takes the opportunity to summon a Kamen Rider.)
Decade K-Touch 21: Gaim! Kamen Ride: Kiwami Arms!
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(Decade summons Kamen Rider Gaim in Kiwami Arms, and prepares to destroy two of Glaive's shields.)
