Goku was taking Gouki and Bulma to his home.
"So how did you get that monster to do what you wanted it to do?" Goku asks.
"That wasn't a monster silly that was a car." Bulma said.
"Oh, so that was a car. Grandpa told me about them, but I never actually seen one. That means you're from one of those big cities." Goku said.
"You know for a little kid you're really strong." Bulma compliments him.
"Thanks. Grandpa trained me to be like steel." Goku said.
"Your grandpa must have been an amazing guy." Gouki said.
"Yeah, he was." Goku said. A little while later they arrive at Goku's house.
"You have a nice home here Goku." Gouki said.
"Thanks. Just wait here for one second." Goku said as he runs to open the doors. Goku then gasps as on a pedestal was an orange ball with four red stars glowing. All three of them enters the house.
"Listen." Goku said.
"What's up?" Bulma asks from behind him
"Grandpa is trying to talk to me." Goku said.
"But Goku I don't hear anyone talk…" She then trails off as she gasps upon seeing the ball.
"Oh, my goodness it's a Dragon Ball!" Bulma said in surprise. Bulma then pushes Goku out of the way causing Gouki to quickly catch him as Bulma picks up the Dragon Ball.
"Hey, give me my grandpa back now!" Goku shouts as he tries to take it back. Bulma looks at him confused.
"Your grandpa?" She questions before holding the ball up. "You mean this?"
"Yeah!" Goku said taking it back. "This is the only thing that my grandpa gave me to remember him by."
"Wait what's a Dragon Ball?" Gouki questions with a frown. Bulma pulls out a couple more Dragon Balls from her pouch. One had two stars and the other one had 5 stars.
"You have two grandpas!" Goku said stunned.
"These aren't Grandpas. Your ball and mine are called Dragon Balls." She said.
"And what do they do?" Gouki questions.
"There is a legend if you gather all 7 you can summon the Eternal Dragon will appear and grant you a single wish whatever it may be." Bulma said.
"Wow that's amazing! You can wish for anything you want, and it will come true! I wonder why grandpa never told me about this." Goku said.
"A wish huh? Reminds me of the 13 Riders fight." Gouki said frowning deeper.
"13 Riders fight?" Bulma questions. "Wait how did you make everything slow and how did you transform into that warrior?"
"Kamen Rider. We're well those on the side of good are heroes of justice who fight to defeat evil where it may be. As to how I did the slowdown I am a cyborg and some of my cybernetics are from a race of machines called Roidmudes that can slowdown things like I did except for fellow Roidmudes and certain people when equipped with something." Gouki said.
"A cyborg?" Goku questions with a tilted head.
"I am a human, but my body has been enhanced with machine parts." Gouki explains.
"Why did you become a cyborg?" Bulma questions causing Gouki to gain a dark look on his face.
"I rather not talk about it." Gouki said in a tone that scared Bulma a bit.
"O-ok." Bulma said.
"Wait a minute does this mean others might know about them and could be collecting them too?" Gouki realizes. Bulma's eyes widen.
"Um could be" Bulma said a bit worried.
"Then we need to collect them quickly. Most likely there is someone who wants to use them to conquer the world or something like that." Gouki said. This makes Bulma worry even more.
"I-I didn't think of that." Bulma said.
"It happens. We should assume they might have something to find them." Gouki said.
"Well, I did make this." Bulma shows them a radar. "I call it the Dragon Rader and it can show me where the Dragon Balls are if they within range."
She shows it off showing them the radar was showing the three Dragon Balls they have and four Dragon Balls far away from their location.
"We should head for the nearest one." Gouki said. "Though after getting all 7 question is what the wish should be. If this wish is powerful enough it can change this world for the better."
"Hey, Bulma what do you want to wish for?" Goku asks. Bulma decides to be honest.
"A boyfriend." Bulma said.
"A boyfriend? You realize you can and will make one eventually. Besides do you even have any details planned for this boyfriend wish?" Gouki asks.
"Um no." She said sheepishly. Gouki facepalms.
"If this was a monkey's paw then you'll be screwed." Gouki said.
"A monkey's paw?" Goku asks.
"It's a cursed object that grants wishes but then makes them into your worst nightmare." Gouki said. "If Bulma isn't careful in how she words her wish or doesn't go into enough details she can accidentally wish for an abusive boyfriend."
Bulma pales as Gouki's words were true. Just then the mountain starts to shake causing them to grab something to hang on.
"An Earthquake!" Bulma yells.
"Is this normal here?" Gouki asks Goku.
"No!" Goku said. Then they hear an inhuman roar scaring Bulma as Gouki narrows his eyes.
"That wasn't human, and I doubt it was from a normal animal." Gouki said as the earthquake then stops. He and Goku run out and sees a humanoid goat monster with red eyes (The Goatman from Hunting the Goatman) that roars once more.
"What is that thing?!" Bulma shouts fearfully.
"It's the mountain demon! But grandpa sealed it away!" Goku shouts in surprise as he remembers the stories his grandpa told him about it.
"Which means either the seal lost power or someone let it free." Gouki said as he takes out the Decadriver and places it on his waist causing the belt straps to appear before Gouki pulls the Driver.
"Goku keep Bulma safe. I'll take care of this demon." Gouki said as he pulls out the Ride Booker and takes out the Decade Card.
"Got it!" Goku said as while he wants to fight the Goatman he understands that Bulma needs protection.
"Henshin!" Gouki said as he slots the card into the Driver.
KAMENRIDE!
He then closes the Driver starting the transformation.
DECADE!
Then the symbols of the Main Riders of the Heisei Riders appear around him before turning into images. They then merge with Gouki forming the suit as lines appear above him and combine with the helmet completing the transformation.
The Goatman roars as it charges at Decade. Decade fires at it with the Ridebooker but it doesn't do much as it backhands him into a tree causing it to break. Decade gets up thankfully his armor took the brunt of the damage and ironically his cybernetic enhancements no matter how much he hates how he got them. He then fires at the beast again making it angry and it charges at Decade. Decade waits for a moment and rolls out of the way at the right second making it break through some trees.
"Ok this thing is tough, but I should be able to beat it as long as I play it smart." Decade mutters. "Though since it's a demon I would love to have a Hibiki Rider Card right now."
Unfortunately for Decade/Gouki he started this journey without any Rider cards besides the Henshin, Rider Blast, Invisible, Rider Slash, Final Attack Ride and Illusion Rider Cards. Which gives him an idea as he takes out a card and uses it.
ATTACKRIDE: ILLUSION!
He creates two clones and they charge at the Goatman as the original Decade takes out another card and uses it.
ATTACKRIDE: INVISIBLE!
He turns invisible as the clones slashes at the Goatman as it roars before punching one clone so hard he was launched into some trees. The Goatman roars in anger as he aims for the second one The Clone takes out a card and uses it.
ATTACKRIDE: BLAST!
The Clone fires at the Goatman. The Goatman roars in pain and rage but swings it's arm at the clone.
ATTACKRIDE: SLASH!
But the real Decade slashes at the arm making it roar even more but it hits both Decades away. He roars in pain.
"That hurt." Decade winces. "I could use the Slowdown but that might not work. I really wish I had a Hibiki Rider Card."
The Goatman roars and rushes at him. Just then three cards comes out of the Ride Booker and he grabs them before he quickly dodges the monster's attack.
"Mochizuki?" Decade questions seeing the name on the card. "Well let's try it."
KAMENRIDE: MOCHIZUKI!
Decade changes to become a new Rider. The rider suit is based on the body of Zen-Aku/Duke Org Rouki from Wild Force/Gaoranger with the belt changed to the Ongekiko Kaenzetsumi, silver highlights, and the full moon on his stomach. His helmet is based on Kamen Rider Eiki colored black and silver with the horn of Zen-Aku/Duke Org Rouki. There is a flute dagger based on Zen-Aku/Duke Org Rouki's Crystal Flute minus the holes for the Animal Crystals/Gao Jewels and it has a demon face like the Henshin Onibue that has a full moon on its forehead with it stored in a holster on the Rider's right side of his waist on the belt.
This is the Moon Oni Flute and the Rider's name is Kamen Rider Mochizuki!
"This is a new rider." D-Mochizuki said in surprise. The Goatman roars and tries to attack him again. D-Mochizuki dodges before taking out the Moon Oni Flute and plays a tune on it causing the Goatman to stop in its tracks and roar in pain. The Goatman tries to break free as he roars
D-Mochizuki then takes out the second new Card and inserts it into the Driver.
FINAL ATTACKRIDE! M-M-M-MOCHIZUKI!
The Moon Oni Flute transforms into a sword that is based on Zen-Aku/Duke Org Rouki's sword with a silver edge and a picture of the full moon on it.
This is the Grace of the Moon.
D-Mochizuki gathers silver colored energy into it as the Goatman tries to rush attack him.
"Getsugo Tensho!" D-Mochizuki shouts before slashing it causing an energy blade to emerge from it. The Goatman roars but the slash hits it cutting it in half before exploding! D-Mochizuki then transforms back into Gouki.
"That was lucky." Gouki said referring to getting the form.
"That was awesome! You defeated the Mountain Demon!" Goki rushes over to him in excitement. Gouki ruffles his hair. Bulma was stunned at what happened.
"I-I'll be right back." She said having peed her pants in fear as Gouki was battling it.
"I wonder what's wrong with her." Goku wonders. Gouki shrugs but looks at the sky wondering if the legend of the Dragon Balls was true. If he could make a wish, what could he wish for?
Thanks to Light Hero Kaiser for helping me with the fight scene and finishing this chapter up. Also, I am thinking of adding the Dragon Ball movies to this but not sure how. One idea is while Goku and the others are doing stuff Gouki does some of the movies by himself. What do you guys think? Also, for those wondering about Mochizuki he is a OC Oni Rider I made with some help. He will be in the Music Day holiday Doc hopefully for this year since I decided to try and save Saint Patrick's Day for later years since there is only two things on the man I can make. Plus, there are Saint Patrick Day related monsters I can make like Clovers for example which is even more reason to save them.