The scene shows the fairgrounds in chaos as civilians run away from the hordes of Grimm. Atlesian Knight-200s are seen firing at the dark creatures, and a vendor hides behind his booth when a group of Ursai run past. Several Nevermores fly across the sky, one holding Roy Stallion in it's talons. The members of Teams NAAE (Unimaginable), RWBY (Ruby), and JNPR (Juniper), with Jaune carrying an unconscious Pyrrha, watch in horror of everything going on around them. Civilians continue to flee as Grimm continue to run amok, and a dead Creep on the ground starts to dissipate.
Weiss: "I don't believe this..."
Blake: "It's just like Nick said..."
Yang: "Nick...please tell us you have a plan?!"
Nick: (gives a confident smirk to his friends) "Come on, guys...you should know by now that I've been on step ahead."
Just then, a Beowolf charges at the gang, as Nick just smirks at it.
Nick: "Rise...Igris!"
Suddenly, a black knight-like creature emerged from Nick's shadow, and slashed the Beowolf, killing it with one strike. This leaving the gang in shock, as the knight stabs its sword in the ground, before kneeling towards Nick.
Igris: "At your command, my lord."
Amber: "A friend of yours, Nick?"
Nick: "Yup! This is Igris. Also..."
Nick then snaps his fingers, as Pyrrha wakes up.
Pyrrha: "What...happened?"
Jaune: (places Pyrrha down) "Pyrrha! You're awake!"
Nick: "Well, guys...it's time to use the new gear I gave you all."
The others all look at each other with excitement, and put on their own Drivers.
Team RWBY (Ruby)'s Drivers: Aura Driver!
Atalanta and Nora's Drivers: Desire Driver!
Erza, Jaune and Pyrrha's Driver: Sengoku Drivers!
Ren's Driver: Shinobidriver!
Amber then places a strange ring, with the outline of a hand on it, on her right-hand, before placing it over her belt.
Amber's Driver: Driver On! Please!
The gang then activate their transformations.
Nick's Group: "Kamen Rider!"
Ruby gets surrounded by a swarm of red flower petals, which then scatter as Ruby is now shown in her own Rider Armor as Kamen Rider Rose, as the petals form a cape on her back. Weiss gets surrounded by a swarm of snowflakes, which then scatter as she is now shown in her own Rider Armor, as Kamen Rider Frost. Blake gets covered by shadows, which then form her own Rider Armor, as Kamen Rider Shade. And finally Yang, gets covered by fire, which then forms her own Rider Armor, as Kamen Rider Burn. Amber then flips two switches on her Driver.
Maidendriver: Shabadoobie touch to transform!
Amber then places another Ring on her left-hand, before placing it over her Driver.
Maidendriver: Autumn! Please!
An orange Magic circle then appears on Amber's left-side, as it moves through her, turning her into Kamen Rider Maiden. Erza, Jaune and Pyrrha pull out small locks, which are known as Lockseeds.
Erza's Lockseed: Saber!
Jaune's Lockseed: Apple!
Pyrrha's Lockseed: Lychee!
Erza, Jaune and Pyrrha then place their Lockseeds into their Drivers.
EJP's Sengoku Drivers: Lock on!
They then pull the sword-shaped trigger, which slice the Lockseeds. Large fruit then appear through small portals above them, before forming their armors, and turn them Erza into Kamen Rider Dame, Jaune into Kamen Rider Orleans, and Pyrrha into Kamen Rider Ligyron.
EJP's Sengoku Drivers: Come on! Saber Arms! Brave Dragon!/Come on! Apple Arms! Desire forbidden fruits!/Come on! Lychee Arms! You are the hero!
Atalanta and Nora then pull out Raise Buckles, with Atalanta holding an Arrow Buckle, and what appeared to be a Boost Buckle, while Nora had Monster and Hammer, before placing them onto their Desire Drivers.
AN's Drivers: Set!
Atalanta and Nora then activate their forms.
Atalanta's Desire Driver: Dual On! Boost, MarkII. Armed Arrow. Ready, fight.
Nora's Desire Driver: Dual On! Monster. Armed Hammer. Ready, fight.
Atalanta then turns into Kamen Rider Leoness Boost MarkII Armed Arrow Form, while Nora turns into Kamen Rider Tanng Monster Armed Hammer Form. Ren then activates his Driver, transforming into Kamen Rider Shinobi.
Shinobidriver: Who is it? It's me! Ninja! Shinobi, arrived!
The gang all then look at each other, amazed by the fact that they're now Kamen Riders. But then...a Nevermore tries to attack them.
KR Orleans: "Incoming Nevermore!"
Suddenly...a lighting bolt strikes the Nevermore, as a very large dark grey dragon is now seen standing on the now dead Nevermore. The Riders then point their weapons at the dragon.
KR Maiden: "Is this guy another friend of Nick's?"
Nick: "Yeah, don't guys, he's cool. (looks at the dragon) Thanks for the help there, Batzz!"
Batzz: "My pleasure, Nick."
Burn: "Wait, his name's "Batzz"?"
Nick: "Well, his full name is Demon Lord Dragon, Batzz. But folks just call him Batzz for short."
KR Dame: "I take it Batzz is here to help?"
Nick: "Not just him..."
As he says this, a massive portal appears in the sky, as several beings fall out from it. These beings being several Buddyfight monsters, Vanguard Monsters, Yu-Gi-Oh monsters, Bakugan, and several more beings.
Nick: "Let's just say...Ironwood isn't the only guy with an army."
Nick then become Kamen Rider Geats LaserBoost Form, as him the rest of the gang charge at the enemeies, as we all of the beings from the portal begin taking down several hordes of Grimm very quickly. As we see beings like Tatsurion the Unchained, Bolshack Dragon, Red-Eyes Black Dragon, Blue-Eyes White Dragon, Pyrus Dragonoid, Darkus Nilious, and Batzz eliminate Grimm left and right. We even see the Cunning Hares, Sons of Calydon, Hollow Special Operations Section 6, Criminal Investigation Special Response Team, Obol Squad, Belobog Heavy Industries (I've recently started playing Zenless Zone Zero), several Super Sentai/Power Rangers, Kamen Riders, and even the Avengers.
New Reporter from a Bullhead: "I can not believe what is happening, folks! Strange beings from a portal that suddenly appeared in the sky over Vale, are currently aiding in fighting the Grimm invasion!"
A Nevermore tried to attack the Bullhead, but was defeated by Number 39: Utopia, and Star Dragoner, Jackknife.
Jackknife: (looks to the news reporter) "Ma'am, I advise you to vacate this area."
New Reporter: "Wait, you can talk?!"
No. 39 Utopia: "Of course we can talk. But seriously, you better get to somewhere safe. We'll handle things here."
The news reporter listens, as the Bullhead flies away to safety. Meanwhile, we see Shadow and Adam witnessing everything going on.
Adam: "What on Remnant is going on here?! Where did those things come from?!"
Shadow: "It's clearly Nick Brown's doing!"
Adam: "What do we do now?!"
Shadow: "I'm going to kill Nick Brown!"
Shadow then teleports away along with the fifth member of his faction, as Adam then spots Blake as Shade with Yang as Burn, and charges at them, shocking Shade.
KR Shade: "Adam?!"
Adam: "Hello...traitor!"
KR Shade: "You're the one who betrayed us, Adam!"
Adam: "Oh, please! I'm doing what most be done for the good of our people!"
KR Shade: "Our people?! You're trying to destroy the peace between Humans and Faunus!"
Adam: "The Humans are to be eliminated! You, and the rest of the White Fang are weaklings! And I will end you, Belladonna!
Adam then summons a small gun.
Gun: Laser Raise Riser.
Adam then places a card into it.
Laser Raise Riser: Taurus Set.
Adam: "Kamen Rider!"
Adam then pulls the trigger.
Laser Raiser Riser: Laser On. Taurus Loading. Ready, fight.
Adam was now transformed into a black-and-red bull themed Kamen Rider.
He looks like Kamen Rider Ziin, but with Beroba's Bull Motif.
Burn and Shade look in complete shock at Adam becoming a Kamen Rider, as the they start fighting him. Taurus did gain the upper hand on Shade and Burn, but then a fourth Kamen Rider appeared. This being a familiar magenta Kamen Rider.
KR Burn: "Kamen Rider Decade?! Where'd he come from?!"
KR Taurus: "Get out of my way! Or you will die along with the filthy traitor and her pathetic Human friend!"
Instead of responding, Kamen Rider Decade transformed.
NeoDecadriver: FormRide: OOO! Hafodor Eternaty! Hawk! Peafowl! Condor! (Phoenix screech) Ha~fo~dor! E~ter~nity!
D-OOO then began fighting Taurus, and quickly overpowered him. Even when the two Spider Kamen Riders showed up to help Taurus, D-OOO easily defeated them using his finisher, forcing them to de-transform, revealing the two Spider Riders to actually be the Malachite Twins, Melanie and Miltia. Before an enraged Adam tried to attack D-OOO, Miltia used a small device that teleported her, along with her sister and Adam away.
KR Burn: "Thanks for the help there, Nick."
KR Decade: "How'd you know my real name?"
KR Shade: "Because you're our boyfriend?"
KR Decade: "Huh...so this dimension's Nick is dating the members of Team RWBY (Ruby)? And I guess he's a Kamen Rider as well."
KR Shade: "Wait...you're not OUR Nick, are you?"
KR Decade: "Nope, I'm a Nick from another dimension. You're actually the first to already know who I really am. Anyways, I better get going."
I feel like it was obvious who THIS Kamen Rider Decade really was...
KR Burn: "Hang on, aren't you going to help us?"
KR Decade: (opens a portal behind him) "Seems like you guys have the situation under control."
With that, Kamen Rider Decade walked through the portal. Meanwhile, Nick, as Geats LaserBoost Form, was fighting Grimm with Igris and Chronojet Dragon, Shadow appeared out of his shadow, and tries to strike Geats, who repels the attack.
KR Geats: "I'm guessing you're the one calling the shots?"
Shadow: "I am Shadow Cladis. And I will be the one to kill you, Nick Brown!"
KR Geats: "Whatever, dude. Igris, Chronojet, I'll handle this guy."
Igris and Chronojet Dragon nod before leaving to fight other Grimm, as Shadow then pulls out a new Driver.
KR Geats: "A Driver?! It looks like the Destream Driver, but with the color schemes and design of a Grimm."
Shadow then places the Driver on his waist.
Driver: Grimm Driver!
Shadow then pulls out a Vistamp with a tiger on it.
Vistamp: White Tiger!
Shadow then stamps the Vistamp onto to pad on top of the Grimm Driver.
Grimm Driver: Corrupt!
A familiar emblem then appears on the ground under Shadow, as black tar emerges from it.
KR Geats: "Wait...is that Grimm Tar?!"
Shadow: "Kamen Rider!"
Shadow then stamps the screen on the front of his Driver, as the Grimm Tar erupts and completely covers his body.
Grimm Driver: Grimm Up! Chaos! (Destruction) Carnage! (Darkness) The Jet-Black Harbinger of Calamity! (Absolute Annihilation of Everything) Kamen Rider...Grimm!
The Grimm Tar then solidifies, forming Shadow's Kamen Rider suit.
He looks like Kamen Rider Jack Revice, Crimson Vail, and Kamen Rider Blood Vade, but with a tiger motif instead of a T. Rex, and the color schemes of a Grimm.
Geats then begins fighting Kamen Rider Grimm, with both being equal.
KR Grimm: (pulls out a new Vistamp with the image of a Beowolf) "Enough of this!"
KR Grimm then presses the Knocks on both sides of the Driver before activating the new Vistamp.
Grimm Driver: Add!
Vistamp: Beowolf!
KR Grimm then stamps the Beowolf Vistamp on the top of his Driver, then the screen.
Grimm Driver: Dominate Up! Beowolf! Genomix!
KR Grimm's arms then get covered in Grimm Tar, before morphing into the arms of a Beowolf.
KR Geats: "He can use Genomix?! Who the heck is this guy?!"
KR Grimm then repeats the process gains two more Genomix's, giving him the tail of a Death Stalker, and the wings of a Nevermore.
KR Geats: "I'm not getting anywhere with this guy! Unless..."
Geats then holds out his right-hand, as a white and red Raise Buckle appears.
Geats: "I wasn't planning to use this Buckle yet...but it seems I may have no choice."
Geats then removes the Boost MarkII Buckle and Laser Raise Riser from his Deisre Driver, before splitting the new Raise Buckle into two.
Raise Buckle: MarkIX!
For those who don't know, IX is the Roman numeral for 9.
Geats then sets both parts of the MarkIX Raise Buckle onto his Driver.
Desire Driver: Set Ignition.
The word "Boost MarkIX" then appears floating beside Geats on his right, while a small white robot nine-tailed fox named Legend Kyubi appears next to Geats.
KR Geats: "Kamen Rider!"
Geats then activates Revolve On, causing the two Buckles to form a white nine-tailed fox.
Desire Driver: Revolve On!
Geats then pulls the right-handed trigger.
Desire Driver: Dynamite Boost!
The Legend Kyubi then runs around in a circle as nine fox tail like pillars surround Geats. The Legend Kyubi then form the top-half of Geats' armor, while a second armor forms the lower-half, as the nine pillars wrap around Geats before dispersing.
Desire Driver: GeatsIX!
Blue energy starts to form cracks on ground behind Geats, with the sound of a formula-1 nitro engine reviving up can be heard in the background, as the nine pillars burst out of the ground, and attach to Geats' back, forming a cape.
Desire Driver: Ready...FIGHT!!!!!
KR Grimm: "WHAT?! This power he's releasing...how is this possible?! He shouldn't be capable of possessing such power! It surpasses the limits of his power!"
GeatsIX then forms a ball of silver energy in his left-hand, before raising his arm towards the sky.
Desire Driver: Boost IX Strike!
GeatsIX then releases a silver energy surge that not only vaporizes every single Grimm in the City of Vale, but also repairs the damages, and both revives and/or heals everyone who had died or got injured. We now see Kamen Rider GeatsIX and Kamen Rider Grimm, who was injured by the blast, now standing in the arena.
KR Grimm: "NOOO!!!!"
The woman with Kamen Rider Grimm then falls to her knees, as the mask on her faces disintegrates.
Woman: "What's happening...where am I? Is that the Kamen Rider?"
KR Grimm: "NO!! The Chill inside the Summer Maiden's mask was destroyed! I lost control over her."
KR GeatsIX: "Wait...that's the Summer Maiden? Her mask must've had a Grimm inside it that allowed this guy to control her."
KR Grimm: "You ruined everything! Just DIE ALREADY!!!"
Kamen Rider Grimm then presses the Knocks on his Driver twice, causing energy to surge across his body.
Grimm: More!
GeatsIX then activates Boost Time, causing energy to surge across his body as well.
Desire Driver: Dynamite Boost Time!
Both Riders then unleash their finishers.
Grimm Driver: Beowolf! Nevermore! Death Stalker! Forbidden Requiem!
Desire Driver: Boost IX Victory!
Both Kamen Riders then deliver a powerful Rider Kick at each other, though GeatsIX ended up victorious, with Kamen Rider Grimm being forced out of his transformation.
KR GeatsIX: "Now then...I want answers. Who are you? How do you have Kamen Rider Gear? How did you manage to capture the Summer Maiden, and control her? And why do I feel like you're connected to the Jyamato Grimm back in the Forever Fall?"
Shadow then stands up, albite injured, as his tiger mask breaks in half, revealing his true face, with GeatsIX being completely shocked.
GeatsIX: (shocked) "W-What?! Why do you...look like me?!"
Yes, Shadow looks...exactly like Nick. With the only differences being Shadow having deathly pallor skin, with jet black sclerae in his eyes and glowing crimson irises, and white tiger ears on his head.
GeatsIX: "Who are you?! Why do you look like me?!"
Shadow: "I have already told you, Nick Brown...I am Shadow Cladis. And the next time we meet...I will destroy you, and everything and everyone you hold dear. And you may keep the Summer Maiden...for now."
With that Shadow then summons a portal of shadows, as GeatsIX tries to stop him from escaping.
GeatsIX: "No you don't! You're not going anywhere until I get answers!"
Unfortunately, GeatsIX was too late, as Shadow had successfully gotten away. Suddenly, GeatsIX's vision stared to blur, as he also starts to feel weak.
GeatsIX: (thought) 'Dang it...I knew it was too soon for me to use MarkIX...I can't stay in this form...much...longer..."
GeatsIX then turns back into Nick, looses consciousness and collapses. The scene changes to a familiar castle in a dark land, as an injured Shadow enters a large room, before falling to his knees due to his injuries. In the room was also an injured Adam, a familiar Faunus with a scorpion tail, and a man with a civil war mustache (No, it's not Eggman from the live-action Sonic the Hedgehog movies).
Shadow: "The invasion failed...the Kamen Rider...he's stronger then he's supposed to be!"
Adam: "Isn't the Kamen Rider always powerful? Also...that is your true face? You've removed your mask before. Why do you look like the Kamen Rider?"
Shadow: "It's no of your concern, Adam Taurus. I was so close to finally killing Nick Brown. But he wiped out every Grimm in the City of Vale, which was nearly every Grimm in the entire Kingdom of Vale, and now he has the Summer Maiden!"
Just then, an all too familiar woman approached Shadow. This woman...was Salem.
Salem: "Calm yourself, Shadow. This lose is only minor."
Shadow: "Minor? Minor?! How was this a "minor defeat"?! Nearly every Grimm in the Kingdom of Vale got vaporized in mere seconds! We also lost the only Maiden we managed to capture! I told you we should've unleased the new Grimm we created!"
Salem: "All in good time, Shadow. For now, we shall lurk in the darkness. Allow the people of Remnant to believe they are safe. And then...you shall destroy the only symbol of hope the people of the world have. And you will do so, with our new Grimm."
Everyone in the room then look out the window, to see two large Grimm. One looking like a Beowolf, but was four times the size of an Alpha Beowolf, and had three heads. The other was larger, and had a draconic appearance, and had five heads.
Adam: "What are those Grimm?"
Shadow: (smirks evilly) "I call them...Cerberus, and Hydra. The strongest of all Grimm."
Time Skip...
The scene cuts to Nick asleep in an unfamiliar bed, wearing gray pajamas. Birds are tweeting and sunlight is streaming onto the wall behind the bed's headboard. After a few seconds, he wakes up and looks over to see all of his friends, as well as Penny, asleep across the room. He sits up and groans quietly, causing Ruby to stir awake.
Ruby: "Nick! (hugs her boyfriend tightly in tears) You're awake!"
Nick: "Ugh...Ruby...some space, please?"
The commotion causes Yang, Blake, Weiss, Amber, Erza, Atalanta, Jaune, Pyrrha, Nora, Ren, and Penny to all wake up as well.
WBY, AAE, JNPR (Juniper), and Penny: "Nick!"
Nick: "Hey, guys...I miss anything?"
Weiss: "Don't try to act cool! You've been unconscious for four whole weeks!"
Nick: "Four weeks? Seriously? Sorry for making you guys worry. So, um...where...are we right now?"
Yang: "We're at mine and Ruby's place, in Patch."
Amber: "After what happened in Vale, Ozpin decided to everyone at school a vacation to recover."
Nick: "And Penny's here too...surprised Iron-brain let you."
Penny: "He actually doesn't know I'm even here. I kind of came here myself."
Blake: "What exactly did you do, Nick? There was a massive energy surge that destroyed every single Grimm in the city."
Nick: "I'll explain later. Right now...I'm tired...and crazy hungry."
After a while, Nick and the gang were now in the living room along with Summer, Qrow, Ozpin, Glynda, Rossweisse, Ironwood, Ruby and Yang's dad; Taiyang Xiao Long, the Summer Maiden, and Yang's mom; Raven Branwen, who led her tribe in helping against the Grimm, while saying the Branwen Tribe's help was "on the house". This was one of the changes caused by Nick, in which bandits could perform raids out of fear of the Kamen Rider taking them down, so when Raven became the leader of the Branwen Tribe, they went from bandits to mercenaries. And while Raven did leave Tai and Yang, it was because she didn't want people going after them because of her, while sending birthday and Christmas cards to her daughter and friends. But, after Yang graduated from Signal High, Raven became more of a direct part of Yang's life. Right now, Nick, after eating an amount of food that rivals Son Goku's apatite from Dragon Ball, was explaining how he used Boost MarkIX, which gave him the powers of a God of Genesis, and the Summer Maiden, who's name is Akiza Thornheart (She looks like Akiza from Yu-Gi-Oh 5Ds), and how she was under mind control until her mask got destroyed. The gang also got to meet the Spring Maiden, who's name is Vernal Iris (The Vernal from the show was going by a fake name while as a decoy Maiden. So I decided that the Spring Maiden who Raven killed in the OG Timeline was the "real" vernal. Also, she looks like Iris from Pokémon), with Ozpin making arrangements for Akiza and Vernal to atend Beacon as students, and Nick also having Penny transferred to Beacon as well, with Akiza, Vernal, Penny and one of Penny's teammates from Atlas, who is a Chameleon Faunus named Ilia Amitola, being Team APAI (Aspiration). Though Ironwood was against Penny staying at Beacon, he now only has one seat in the Atlas Council, and Nick stating that Penny can stay at Beacon is she wants to. Anyways, right now, Nick and the gang are going to relax and recover from the crazy intense battle. As the scene fades to black...