Futto, The city of mystery; On the outside, a marvel of wind energy industries, but below that surface is a dark, dark world. The city is constantly under siege by the threat of Gaia memories, Devices capable of changing humans into monsters with devastating powers, known as dopants. Fuuto has a force against the plague of Gaia memories, Kamen riders. Kamen riders are people who also use Gaia memories, but different ones in order to fight back against the dark hand of "The Museum", the underground syndicate responsible for the distribution of Gaia memories.
Our story begins In the Futto Stadium where, detective Shotoro, has cornered a man under the suspicion of being the one causing stores to lose all gravity and then a monster going and stealing what it could before the store wonder could figure out how to move in the zero G environment. "You're not putting me away, I HAVE TO HAVE GOOD OF A LIFE!" the criminal barked out as he pulled a USB memory from his pocket. But this one was odd it was textured lie it was made of bones and on it, it also had a stage G written on it. He pressed the front of it just below the "G." "GRAVITY!" The USB said, it was a Gaia memory. The criminal then pulled back his arm revealing a connector port and pushed the memory in. Instantly he changed into a Dopant, it's whole body was warped as if in a flux of gravity. Shotoro smirked as he pulled out a small red device with two slots. "Phillip!" he said as he put the device on his lower body, instantly straps spring from the device making a belt.
"Hm?" Phillip said as he noticed the same device appear on his pelvis, he knew what to do. He pulled out a USB this one was slick and green with a large C on it. It too was a Gaia memory but not one used for evil. "Cyclone!" The memory proclaimed as Phillip pressed the button on the front. "Henshin." Phillip said before slipping the memory into the right slot of the device. The memory disappeared and Phillip passed out.
Back at the stadium the green cyclone memory appeared on the right side of Shotoro's device, he pushed it in. He then took out a black Gaia memory with a J on it. "Joker!" It said before Shotoro slipped it into the device and moved the two slots apart forming a W with the device. "Cyclone, Joker!" the memories said and instantly wind blew around Shotoro as his body changed. His left half of his body was covered in black armor with purple stripes, his right green with gold stripes. "Now let me count your crimes!" Shotoro and Phillip said as they now shared a body. Together Phillip and Shotoro were not just detective partners, they were "The two in one Kamen rider Double."
"K-Kamen rider!" the Gravity Dopant stuttered as he took a step back. Then a smile grew on it's face, "Kamen rider has seven memories, if I beat him I can have 8 memories, and so much power I'll be invincible!' "Come on!" He yelled as he thrust his hands forward, which began to glow blue. Suddenly everything in the indoor stadium that was no nailed down began to rise into other air. "Let'S see how you fight on my turf!" The Dopant said before flipping a figure and sending twenty of the floating balls flying at Double. Quickly double switched the green cyclone memory with a yellow one with a moon on it. "Luna, Joker!" With that Double's green half changed yellow with silver stripes. He flung his arm to the right and it stretched with the power of the Luna memory. He grabbed onto a support beam and reeled himself out of the way of the balls. Double the took out the joker memory and put in a blue memory with a gun shaped T on it. "Luna, Trigger!" His black half now blue, and a gun in his hand, double took aim at the monster. He fired off three quick shots. The monster went wide eyes but waved his hand changing the gravity in the area the bullets passed in and sent them flying to the left. "Is that all you have!" the Dopant taunted. "Nope." Shotoro said as the bullets curved around and hit the Dopant into the back sending him flying to the ground. With the Dopant distracted by pain the gravity returned to normal. "Now!" Phillip told Shotoro "Right." With that double went for a run down the stands, while at the same time removing the Tripper memory from the belt and sliding it in the gun. "Trigger Maximum drive!" The trigger memory announced. Double leapt into the air once at the end of the stands. "Trigger full Burst!" Double announced as he sent out a shot hitting the Gravity Dopant Dead center. When the smoke cleared the Dopant was Human again and the memory forcefully ejected from the port and fell to the ground before shattering. Double pushed the Belt back to it's standard position and took it off, separating Phillip form Shotoro's body and sending him back to his on as well as changing Shotoro back to normal.
As the police arrived Shotoro walked out of the stadium. "Hm?" Shotoro noticed something reflecting Sunlight. He knelt down and his eyes went wide. It was a red Gaia memory, like his, but this one was odd, instead of a letter shaped like it represented, it had a picture of what looked like a red demon. He turned it sideways to read the name of the memory, his English was rusty but he figured he could try and read it. "Momotaros?"