Kamen Rider Geats: A Delicate Girl with S-Rank Strength and Speed

[Kamen Rider fanfiction + original worldbuilding + all heroines fall for the female lead + strong heroine + romance-averse and clueless about love + transmigration + supernatural resurgence in the pre-transmigration world, with some Honkai Impact 3rd elements]

Chen Bifang, the Fire Wuchang who guarded Shanhaiguan, was killed instantly when a steel rebar from a nearby construction site pierced her head the day before a boxing match.

Right up until her death, she was still agonizing over opening the Kamen Rider Geats belt she'd bought and discovering that the hidden prize was a “Special Grade Cursed Object.” After her death, an unknown System informed her that it had bound itself to the wrong Host. To make it up to her, the System was forced to sign an “unequal treaty” with Chen Bifang.

When she woke, she found memories of experiences she'd never had in her head, and concluded that her former self had been an idiot.

Now Miyagi Bifang instead of Chen Bifang, she couldn't believe what had happened, so she went out to get familiar with her surroundings and met a handsome boy in her class: Ukiyo Ace.

And so began her career as a Kamen Rider saving the world.

“I am Kamen Rider Rother.”

“Raise the Sword of Rebellion to the heavens!”

“I'm no saint either, so two bad people make a perfect pair.”

“If it's what you want... I don't blame you.”

“Let's just say I spent sixteen years dreaming a magnificent dream.”

Just as she thought she could return to her original world, she turned around and realized she'd already formed bonds with this world that she couldn't bring herself to sever...

“As expected of the bravest warrior in the Hall of Heroes.”

“I'll make this world what I want it to be!”

“I'm Rother, Kamen Rider Rother!”