Kamen Rider x HighSchool DxD: The Supernatural Rider

Prologue

The Three Factions started thousands of years before the start of the story after the Biblical God cast out Angels that opposed his teachings, creating the Fallen Angels who inhabited in the Underworld alongside the Devils. Unlike other supernatural groups (Norse Gods, Hindu Gods, Greco-Roman Gods, etc.) which were apparently more or less independent of each other, these three factions were all interconnected. Together, the Three Factions spawned the Judeo-Christian religion, and became part of the Bible.

The Three Factions of Angels, Devils, and Fallen Angels eventually warred against one another under the leaderships of the Biblical God, the Four Great Satans, and the Fallen Angel organization, Grigori, led by Azazel, in a conflict which came to be known as the Great War which continued for an unknown period of time till it ended hundreds of years prior to the creation of the Kuoh Treaty after the deaths of the Biblical God and Four Great Satans.

Following the deaths of the Biblical God and the Four Great Satans as well as a massive lost in their main forces, the Great War finally ended, but it left the Three Factions in a state of conflict. However, due to a state of extreme exhaustion after the Great War and with all three factions losing their main forces, neither of the three sides wanted to continue battling. So while there was no peace between the factions, outright battles did not occur either.

The Factions continued in this state with occasional conflicts between members who crossed paths for countless millennia.

But then more than 40 years ago the Three Factions sensed something in the humanworld, they saw an evil organization which ambition is take over the world but in the same time a legend was going to born in the human world, the beginning of the Kamen Riders, they protected earth over decades since 1971, they were the first heroes who appeared in earth then the Super Sentai who appeared in 1975 then more heroes appeared in Japan but who saved the world and the universe for many years, then in the year 2000 a new legend for Devils, Angels, Fallen Angels will mark all history, the birth of a hybrid child and the birth of Kamen Rider Kuuga the mark of the Heisei Riders then in 2014 a boy named Akira Hyoudou, brother of Issei Hyoudou was seeing his collection of Kamen Rider figures.

Issei:"Hey Nissan Why are you so intersed in those figures?"

Akira: "Because they fight for Justice, they are Kamen Riders."

Issei: "Akira-nii, Why don't you join me to see "more things" if you're interested?"

Akira: No, My dream is being a Kamen Rider they're my favorite heroes and same to the Super Sentai.

Issei: *thinking* Akira you'll never change if i wasn't interested in women I'll said "I love you" but i keeped this secret for years.

Akira: But i know that they protect us for generations and i want to be like them?

Issei: How?

Akira: They risked their lifes for protect us.

Issei: Akira.........

He thought it very sad

Akira: Yes Issei?

Issei: N-nothing, hey it's late for school.

Akira: Yeah you're right.

Then in other place, in Kuoh, a man watching with a Magneta Blackbird Fly 135 Twin-lens Reflex Camera