Iwae! For the birth of new story! I am a great fan of both Kamen Rider and Super Sentai. It was because of them i learned about Japan and Anime.

I read fics about Zi-O x MHA. Unfortunately there is only a few and they discontinued or very slow update.

Big thank you to GhostKaiser23, Starlight's Poet and TheOkWriter for inspiration and detailed description of the Rider's suits.

There will be some changes in original Zi-O's story.

P.S. I don't own Kamen Rider Zi-O or Boku no Hero Academia. It belongs to their respective owners. Cover is also not mine, it belongs to twai.

Prologue: Future 2068! End Time.

Year 2068.

The world is dead.

What was before deep beautiful forests became a fried dessert with little twigs. Big blue oceans become dried bottoms. Clear skies become polluted red. Where mountains were before now crushed rocks. All megapolises change to abandoned ghost towns.

Entire population reduced from 100 billion to at least hundreds.

In total the world becomes a wasteland.

The only thing that wasn't destroyed is a big monument in the center of the country which was called Japan.

It contains statues of 19 armored warriors and one 'normal' human. Their motifs are similar and different to each other. They represent from mystical magic and ancient civilization to genius gears and futuristic technologies. The only thing that has each statue have belts around their waist. And the person in the center is Young teenager boy with freckles and bushy hair. At the bottom of the monument is an article.

"In the name of Kamen Riders. True protectors of the planet. Let the world remember their noble sacrifice."

Near the monument stands a figure remembering good times of the past. Clad in black suit he had elegant gold winged shoulder pads, gold lining and padding on his arms and legs, a giant golden rolled-styled watch band wrapped around his chest like a sash, golden belt with a display screen which had golden wing extensions on the side and coming from his back where two giant white clock hand styled like a cape. He wore a helmet which looked like a giant golden watch with a blank face. His visor reads "Rider" (ライダ) in katakana in the rough shape of an eagle. On his forehead were three golden watches, two of them are set to the '10' and '2' position. While the silver symbol on his forehead reads "Kamen" (カメン) also in katakana.

His aura alone can make an army surrender. Everyone who comes close to him feels fear. He would obliterate you with a simple glance.

Suddenly around the figure appears many people, half of them armed to teeth others activate their powers. In addition, giant robots' lands near them making a small army.

However, black 'cornered' doesn't look afraid. If anything, it looks amusing to him that these pathetic worms think that they can kill him.

The army made their move. Weapons shoot, fireballs, lightning, water, energy, ice and many others attack him. People become big, have rock and steel skins, and transform into beasts. Even robots fly to obliterate their target.

Unfortunately, the 'target' merely gives them a glance. He simply flicked his wrist making everyone freeze. Then he waves his hand and a film of distortion runs around the air and every attacker and machine defeats or destroys much to the shock of an army.

He then looks at the remains of the people and decides to remind them about their place. So, then they would stop trying killing themselves.

"You have no chance to defeat me", he announced his voice is both soft and terrifying. "Do you know why?"

"Because there are no more heroes in this world."

"This person is Kamen Rider Oma Zi-O. He was before the strongest hero who ever existed. However, right now he is known as the darkest and worst demon King. Also known as Ma Ō. He became the greatest threat in history because he almost destroyed an entire planet. Nobody knows why he did change his way and how he gained his omnipotent powers. But he is unstoppable and undefeatable, he obliterates entire armies easily. And it was like this for 50 years."

We then found ourselves in the dark room with a single person. He Is black-haired young man who appeared in his late teens. His wavy hair is mostly put to his right side of his face, while his left side is neatly combed and pulled back over the ear. He wears a faded green jacket with dark green cuffs, silver buttons, black trousers and leather boots with straps and gray-purple scarf. In his hand a large book with clock faces and gears emblazoned on it. The cover is the Ohma Advent Calendar.

"My name is Woz. Ohma Zi-O's trustful aide and historical chronicler", announced Woz with a bow. "And right now, I will write down the true story of Waga Ma Ō (My Demon King). This is a story about how Izuku Midoriya became the greatest King of Heroes."

And this how our story starts.

My first change Woz, Geiz and Tsukuyomi will be the same age as Izuku (15 years old).