Smile PreCure but it's Kamen Rider Saber

This is Hyperus18's plot swap/rewrite of Kamen Rider Saber and Smile PreCure.

Plot
In order to prevent the end of the world, the 7 Legendary Warriors (the Power Riders) need to collect Wonder Ride Books. Most of the Wonder Ride Books, however, have been stolen and hidden away. Set to the task of finding Power Riders, TbD, a messenger from the Sword of Logos, follows the other 7 Wonder Ride Books to Earth, where she meets three teenage friends, ready to accept any challenge that comes in their way...

Drew McArthur/Power Rider Pyrus
Henshin Device: Holy Blade of Fire

Kiana Young/Power Rider Aquos
Henshin Device: Holy Blade of Water

Luke Herrera/Power Rider Dendrus
Henshin Device: Holy Blade of Wood

Neal James/Power Rider Electros
Henshin Device: Holy Blade of Lightning

Anabelle Park/Power Rider Ventus
Henshin Device: Holy Blade of Wind

Bryce Clayton/Power Rider Geos
Henshin Device: Holy Blade of Earth

Justin Zhao/Power Rider Cryos
Henshin Device: Holy Blade of Ice

Allies
TbD