The Honkai Kamen Rider Who Began in Fuuto

...This is not a mirror world opposite to reality. This is a corrupted Fuuto Kamen Rider story!

After transmigrating into W, Luo Nian joins Sonosaki Saeko in rescuing Wakana...!

On the Night of Beginning, Sonosaki Saeko gives her life to save her younger sister Wakana, after being attacked by Philip and Shotaro.

At that moment, Wakana asks Luo Nian: "Can you become my formula for victory?"

In a dazzling flash of light, Luo Nian and Wakana become one, transforming into the Kamen Rider who protects Fuuto!

A body with two colors! Two antennae on its head!

This is... Kamen Rider Build!

Their opponent is an enemy commander who also transforms as a duo: the two-toned monster W!

The corrupted Kamen Rider story that began on Fuuto's Night of Beginning... starts here!

This novel and its characters are entirely fictional. Any resemblance to actual events or persons is purely coincidental. Do not imitate.