If you can calculate every position of every atoms and their momentum in the universe, it is possible to effectively foresee the future, or so Laplace said. In the end, the world's just a series of zero and one, and the infinite number between them... Devils? Demons? What's that?

A regular man ends up dying and miraculously reincarnates into Highschool DxD! A world of magic, swords, monsters, devils, and gods! With all the knowledge he has in his back pocket will he change the plot or use it to his advantage? The possibilities are endless! Though there is one small problem, he's about 400 or so years before canon and oh yeah he's human. Let the show begin!

Hyoudou Shosei, the older twin brother of Issei, no sacred gear, but big secrets, big scars, and big balls, follow this kuudere sibling's supernatural adventures as he tries to settle a life and death wager with a pantheon while also trying to avoid dealing with the three factions and the events of the series despite being a resident of Kuoh. Yeah, good luck. OC x OC/Akeno

Roxas Gremory, the son of Sirzechs Lucifer and Grayfia Lucifuge, a Devil who no Devil has seen hide nor hair of in two centuries, makes himself known to the Underworld again. But this time, he is different. Stronger, sexier, and... are those white Devil wings? Is he a Nephalem! Why yes, yes he is. Fem!Vali, Fem!Issei, X-Over Characters, Roxas/Harem. AU.

After having his heartbroken when he saw the woman he loved giving herself to a pervert Kazuya Takahashi will leave his former Peerage and serve under the Strongest Queen while also gathering his own Peerage. With those he can trust surrounding him Kazuya will have to face off against being who wish to do harm to the world, while also dealing with the girls who love him.

Kori was a stoic child raised without love or care, however she was saved from that despair when the memories of her past life returned, restoring the GAMER power she had acquired in death. Now an infamous serial killer with a talent for ice magic and grinding levels inhabits the body of a little girl in Kuoh, goodbye canon as we know it. Gender-bender fic, dark/evil OC.

An American student of Kuoh Academy has a special power that rivals even the most powerful beings in the entire supernatural world. This is his story. (Strong, eventual OP OC) I DON'T OWN ANYTHING! JUST MY OC!

What if Issei played host to a legendary vampire? Canon DxD and characters with a single difference, and the difference has fangs. This is a light crossover with the Monogatari series, but also it's own story. Read and review.

Born with a powerful Sacred Gear which caused his mother and the leader of the Norse Faction to seal it away, Levi Hatake lived a normal life until the seal broke awakening his Sacred Gear. Now as a member of the Norse Faction Levi will show the other factions how he gained the nickname Supernova.

I, who is about to awaken ,am the Celestial Dragon of Infinite Realms. I fill 'infinite', and I forge 'dreams'. I shall become the Supreme Dragon of Chaos, burning within the endless inferno! Issei x harem, OC x harem , slightly overpowered OC

After his family is killed in a fight the young heir of the Abaddon clan is forced to make a choice. Leaving the Extra Demons his house has been apart of for centuries he joins the New Satan faction earning the title of the 73rd pillar. Now the young heir will grow and learn as he comes to face enemies, both old and new. OCxKurokaxHarem

This is a typical powerfic where an OC dies and gets Isekaid into DxD. His soul integrating with the biblical gods and inhereting his power. He will rampage the world and change it according to his wishes.

After defeating Kaguya, Naruko is thrown into the DxD universe. Angels, Devils and magical powers. Did I mention hot chicks? Can this world handle the new Juubi?

Akihito Igarashi (Igarashi Akihito), aspiring writer and artist. Loving son and brother. Just a kind and average man. But after an unfortunate event saving the life of a child at the cost of his own. What fate is in store waiting for him? !Revamped. Rated T for mild coarse language and mild suggestive themes. Credit for the art goes to Anrui

One is an artifact to help humanity defend against the Supernatural. Another is an artifact to slay Gods. But, what could the third be? An ordinary teen finds himself in the Underworld and after a brush with death, he is taken in by the Phenex. He swears to repay them, but how could he, a weak and insignificant human, do such a thing? (Written in my spare time, so updates are rare)

What if Boruto had the same drive as Naruto did? What if Boruto w went to Kakashi when he first got to know of his dojutsu? How would the world of Boruto change? Smarter more sensible Boruto. Eventual Borusara

Ishie Hyoudou is a girl attending Kuoh Academy, a formerly all-girls school, who wants nothing more to find and experience the simple joys of love, but feels she never will beyond her fairy tail fantasies... until one fateful day causes her to learn that her daydreams aren't as crazy as she once believed. (Fem!Issei, non-perverted Issei)

When Issei dies he never wakes up, instead another takes his place, the original and most powerful Devil, finally free from his curse of living human life after human life, a curse placed by his father. All he wants to do is defeat the ultimate evil, Trihexa, and reclaim what was his long ago, but he must recover his power and influence to do it.

This story recalls the days when Irina, during her younger years, was training in the church of England to become an exorcist. This boy that she encounters, however, could possibly make a difference in the way that she sees him. See profile for Status.

Having reincarnated to Highschool Dxd is not fun as behind those ecchi stories is a scary world full of horrors but at least I have cheats that I have when being summoned to another world...Oh well, not my problem anymore but being reincarnated as a girl is weird. (warning massive Au and OOC characters ) (Self-insert story)

Azras Marchosias was a key figure in the Devil Civil War. Afterwards he made a huge sacrifice and was not to be seen for over 100 years. How will the Underworld change with his return?

A Futa story. Do you want to know more? You know what to do...

Do to my weak and frail body, my intelligence, and apathetic nature I was the perfect target for bullying. One day I die due to a gunshot at my idiotic job, then I get reincarnated by an omnipotent being with 5 wishes. What might be those wishes how might the world react to a new god being born? OP-MC, AU. Non-Canon!Harem. Lazy!MC Semi-Dark!OC

Kuroko Tetsuya, the protagonist, treated as a God by Fan girls and boys, because of his looks and sportsmanship, now studying in college degree even he is still on highschool level, but his mind didn't bother because of it. Now, Invited by the emperor to reunite with the other teams and celebrate in his estate, chaos ensured. Warning: grammar errors, KuroHarem

Even after eleven years he still blames himself... the death of his parents, the awakening of a beast that brings fear to all factions. Issei Hyoudou has a sleeping power within him, masked by a talent to tame beasts. His peaceful life changes as the supernatural world catches up with him... and he is forced to 'call' again. LessPervertedIssei/Intelligent[Issei x Kiyome]x Harem!