Kamen Rider Alterum (Ben 10-themed Kamen Rider)

A Ben-10-themed Kamen Rider fanfiction. Hiroki Tennyson, a kind-hearted lone wanderer in a world plagued by a zombie virus, has been chosen by Eunice, an emotionless, selfish girl with a mysterious past, to become the Kamen Rider Alterum. With Hiroki agreeing to become her "perfect" specimen in return for power, the story follows the unlikely pair with their journey across the wastelands of the corrupt continents as they gradually uncover the deepest secrets in the darkest corners of the world.

This story is more Kamen Rider than Ben 10, though most of Alterum's forms are Ben 10-themed. The first chapter should provide sufficient insight into the author's intended direction.

FANARTS of Kamen Rider Alterum (Ben 10-themed Kamen Rider) and more info about the story on fandom wiki: https://kamenriderfanfiction.fandom.com/wiki/Kamen_Rider_Alterum. Beware of spoilers, though.