A Decade of the Unionverse (Kamen Rider Decade X Ultimate Crossover Fanfiction)

Set in the world where Huntsman, Heroes, the Supernatural, and anything possible in existence. Each is gifted with abilities such as: Semblances, Quirks, Sacred Gears, and possibly Magic, All of them go to a well known school called Union Academy, a prestigious academy known for teaching individuals to become more experienced users.

In the incident where the apocalyptic beast called 666 or better known as Trihexa who causes havoc and the brink of destruction. All of the heroes are struggling despite their best effort and stand no chance against the beast. When all hopes are lost, a mysterious traveler of unknown origin faces off Trihexa and ends the disaster. No one knows where the newcomer is but it's only the beginning of his journey.