Disclaimer: I do not own Dimension W or Kamen Rider and they belong to their respected owners except for this one OC.
"Here, Kyōma." Mira handed her partner the Grease Fullbottle, the Grease Perfect Kingdom adapter, and the Three Crows dog tags.
"Wait, this design…" Kyōma looked at the adapter. "It looks similar to-"
"They wanted you to have it," Mira told him. "They would rather sacrifice their lives for yours."
Kyōma tightly held Fullbottle and adapter, the Three Crows, his boys, his friends are gone. They gave him the weapon to beat Phantom Build. Kyōma gritted his teeth at those idiots for making a decision like that all on their own. First, he lost Miyabi, and now... and now he lost those three stooges.
"Mira, go and try to free Tsubaki," Kyōma instructed her.
Mira replied with a nod and did what she was instructed.
Kyōma then inserted the Grease Fullbottle into the Grease Perfect Kingdom adapter.
WELCOME!
He activates the adapter.
ICHI DANKETSU!
He then placed the adapter in his Build Driver.
GREASE PERFECT!
Kyōma rotated the Driver's lever, having the Build Snape form around in a triangle. Instead of armor, it was three human-shaped figures. It was the red Castle Smash, blue Stag Smash, and lastly the yellow Owl Smash.
Kyōma tightly holds onto the three dog tags of his "fallen" friends who gave their lives to give a power boost for Kyōma.
ARE YOU READY?
Kyōma looks at Phantom Build glaring at the man before saying, "Henshin."
FARMERS FESTIVAL! GREASE PERFECT!
The Build Snap closes on Kyōma forming his new armor.
GAKIN! GOKIN! GAKON! DOCKING!
He wore a black bodysuit. There was silver armor on his legs with gold knee pads, and black, gold, silver boots. He had a gold chest piece with yellow, red, and blue lines on both sides of the breast of his chest plate. There are silver armor pads on his ribs. He had red & blue shoulder guards with red shoulder pads that look like a castle attached to the side of his shoulders. Blue armor on his upper and lower arm along with gold cuffs on his wrists. There were blue blades on each of his arms. He wore a gold helmet with the sides being yellow and white optic eyes. He had a blue horn on the helmet similar to a stag beetle and a red center on his forehead that "held" the gold horn on his helmet. This is Kamen Rider Grease Perfect Kingdom.
Grease charges forward, slashing and destroying Guardians with his arm blades before finally facing Phantom Build.
"I will show you why you shouldn't mess with a Kamen Rider," Grease says.
"Hmm, interesting." Phantom Build gave a small chuckle. "I accept your challenge."
Both men charged at each other fist drawn. As they kept fighting the two Riders started using their jets to up their speed and strike against one another in the sky.
"Fury!" Grease strikes Phantom Build on the back.
They crossed blades in the air before Grease got another hit on Phantom Build.
"Hot-bloodedness!"
That last struck sent Phantom Build tumbling to the ground.
"Feel my power!"
Grease aimed his arm blades at Phantom Build who tried to block it with the Drill Crusher but the latter's weapon was pushed away as Grease started to send wild strikes with his arm blades. Grease pushed Phantom Build a few inches back but Phantom Build kept Grease's arm blades with the Drill Crusher.
"And here I was expecting something great…" said Phantom Build with a tone of disappointment. "Is that all you got?"
Phantom Build started to push back Grease with slashes and kicks having the hero being pushed back.
Phantom Build charged forward with great speed and kneeing Grease, sending him tumbling to the floor and rolling down the stairs before he finally hit the bottom.
Phantom Build fired missiles around and at Grease making the latter scream in pain. Grease's body shot out sparks before he fell on his back. Phantom Build walks down the stairs with his hands behind his back.
"Now that I've obtained the white panel, there's no way I'd lose to someone who thinks that bonds make one strong," Phantom Build began to talk. "I'm number one."
Grease clenched his hand where he was still holding the dog tags and started to laugh.
"What's so funny?" Phantom Build questioned him.
"You don't understand anything." Grease holds up the dog tags in front of his face. "I never thought much of it but I am a Kamen Rider. A person who was entrusted to protect the hopes of everyone." Grease started to slowly get back up. "Half-hearted resolve won't get us anywhere." Grease finally stood up on booth legs. "I will be there to answer everyone's hope with the fire in my heart. I… chose this fate to be a Kamen Rider!" Grease placed his hand over his chest. "Fan the flame… and crush everything!"
Both Riders charged at each other as Phantom Build struck his Drill Crusher at Grease's chest but the hero caught Phantom Build's weapon, surprising the villain.
"Nani?!"
Grease screamed as red, blue, and yellow energy burst out of his back.
"What is this?!" Phantom Build couldn't believe what he was seeing. "How is your Hazard Level skyrocketing?!"
Grease then gave Phantom Build red, blue, and yellow energy slashes from his arm blades before sending Phantom Build stumbling back.
Phantom Build got back up and turned the Vortex Lever on his Build Driver. Phantom Build then launched a volley of missiles from his back before performing two consecutive roundhouse kicks towards the opponent, creating a tank track that flew into Grease.
HAZARD FINISH!
Smoke and explosion surrounded Grease but the smoke and fire died down, Grease had a red energy shield from his shoulder pads covering himself from the attack.
Grease began to turn the Vortex Lever on his Build Driver to activate one of his finishers.
BLUE! READY, GO!
Grease covers his arm blades in blue energy before slashing Phantom Build.
STAG SLASH! SHUPAAN!
Grease followed it up with an X-shaped slash with both blades sending Phantom Build tumbling back.
Grease began to turn the Vortex Lever once again.
BLUE! YELLOW! READY, GO!
Grease flies into the air and rams into Phantom Build sending a few inches off the ground.
OWL ATTACK! BORUN!
Grease did three more times in quick succession. Grease landed on the ground and began to turn the Vortex Lever once more.
BLUE! YELLOW! RED! READY, GO!
Grease rotates his shoulder pads forward and charges them, "Here I go!" He shouted.
CASTLE BREAK! GAKIN!
Grease then shot out red energy, firing two streams of that same energy sending Phantom Build onto his knees.
"Where did this power come from?" Phantom Build grunted as red sparks appeared on his body.
Grease didn't answer as he began to turn the Vortex Lever one last time.
BLUE! YELLOW! RED!
"I won't…" Grease turning the Vortex Lever.
GOLD!
"Bow before you!" Grease raises his arm up before charging forward.
READY, GO! PERFECT KINGDOM FINISH!
Grease jumps into the air as images of the Owl Hard Smash, Stag Hard Smash, and Castle Hard Smash performing flying kicks appear alongside him.
DOGODOGODOGODOGODOGON!
The three images then combine with Grease in the form of yellow, blue, and red chains of energy. The energy converges into a colorful vortex of energy on Grease's foot as he delivers a powerful flying kick through Phantom Build, the latter screamed in despair as his whole body exploded.
Phantom Build stood there, his body trembling as his body couldn't take the damage anymore.
"I… was way stronger than you. So how…?" Phantom Build's body weakening. "What was the difference between you and me?"
"I have people to protect," Grease de-henshin changed back to Kyōma. "And you don't. That's all."
Phantom Build's disintegrates into green particles ending Phantom Build's life. It was over Kamen Rider Grease in his Perfect Kingdom Form defeated Phantom Build.
AN: I thought my Vulcan one-shot wasn't good so I thought Kyōma would be better as Kamen Rider Grease. I did a Grease and Grease Blizzard one-shot and decided to try Grease Perfect Kingdom.