Write an interesting, riveting, lengthy, page turning, action-packed series of chapters for a  fanfic that is a crossover between Naruto, Fate Stay Night: Prisma Illya, Majikoi, Bakemonogatari and High School DxD. 

The plot should go something like this, with the below events happening in chronological order:

Part I: Origins

. The soul of the Juubi no Ookami [Ten Tailed Wolf] escapes the seal Hagoromo Ōtsutsuki, known to most people in the Elemental Nations as the Rikodo Senin [Sage of Six Paths] had placed to trap it inside the new moon he had created for eternity, and enters the body of a newborn Kushina Ōtsutsuki, the heiress of the Ōtsutsuki clan of Uzushiogakure no Sato in the Land of Whirlpools after the newborn child's soul ends up passing to the afterlife. 

Kushina's parents are unaware of this, because of their joy at finally being able to conceive a child. 

. Due to her status as the Ōtsutsuki clan heiress and also due to her soul being that of the Juubi no Ookami, an already famous and powerful yokai that became even more powerful due to it consuming a spare Shinju fruit sometime after Kaguya Ōtsutsuki did, Kushina has the Rinne-Sharingan, along with the infamous doujutsu kekkai genkai [eye jutsu bloodline] of the Ōtsutsuki clan, the Byakugan. As she grows, she quickly becomes a master of Fūinjutsu [sealing arts] and the long lost magical arts of the Ōtsutsuki clan, passed down from its founder Hamura Ōtsutsuki, the older brother of Hagoromo Ōtsutsuki, the legendary Sage of Six Paths. 

.Kushina keeps the fact that she has the Rinne-Sharingan a secret, as even she herself is not sure how to use this power.

. She also masters the Jūken style of taijutsu [martial arts] that utilizes the ability of the Byakugan to see and observe chakra in an opponent, to quickly strike the chakra circulation points and shut them down.

. Kushina still ends up in the Hidden Leaf and becomes the jinchuriki of the Nine-Tailed Fox after the destruction of Uzushiogakure no Sato by the Hidden Rain, Cloud and Earth Villages during the Second Great Ninja War. However, due to her true self as the legendary Ten-Tails that the Sage of Six Paths had sealed away and her training as the heiress of the Ōtsutsuki clan, she is able to block out Kurama's influence and regain mastery of her chakra, masking the usage of her own yokai as the Ten-Tails as simply her using the Nine Tails' power. 

. She is also to finally able to understand and use some of the powers of her Rinne-Sharingan, due to secretly reading the Senju and Uchiha secret scrolls. 

. Kushina and Mikoto Uchiha share Minato in a secret polygamous relationship, despite Mikoto's engagement to the head of the Uchiha clan, Fugaku. 

. Itachi is the secret love child of Minato Namkaze and Mikoto Uchiha, and is actually a girl named Isane. Sometime after the Kyuubi attack, she awakens her Sharingan due to the stress and trauma of the event and ends up warping herself via Kamui to Kamakura, where she is found by Tesshin Kawakami, an elderly monk and legendary martial artist, and raised as his granddaughter, Momoyo Kawakami. 


Part 2: Birth

. This version of Naruto is born as a ookami hanyou [half wolf monster] akin to Inuyasha, the protagonist of the Inuyasha anime and manga series. However, he is more akin to Sesshomaru in the fact that he has elfen ears, silver hair and yellow eyes and does not have wolf ears on top of his head, unless he taps into his yokai during emotional distress. 

This is due to Kushina being a primordial goddess as well as a daiyokai [monster lord], giving her child the strengths and powers of a full-blooded yokai while simultaneously allowing him to keep his humanity.

. Due to a poorly worded request, Kushina's soul [the Ten-Tails/Juubi] gets sealed along with the soul of Kurama Ōtsutsuki inside baby Naruto when Minato uses the Shiki Fujin [Reaper Death Seal] to seal away the Nine Tails inside his son. After the sealing, Naruto's hair turns black and his eyes blue, and he gains whisker marks on his cheeks due to the seal also sealing away his yoki and yokai power, along with Kushina and Kurama. 

Part 3: Discovery

. Things remain unchanged until Naruto is about 5 or 6 years old, and is locked in his room inside the orphanage. He makes a wish about not having to be in Konoha again, and due to unconsciously pulling on Kushina's power inside the seal, finds himself being warped via a superpowered Kamui to Kyoto in Japan, where he is quickly found by salaryman Gorou Hyoudou and his wife, Miki.

. Gorou and Miki adopt Naruto as their son, Issei Hyoudou and Issei grows up in a loving home, never knowing the truth of his origins or what is sealed inside of him. He becomes fast friends with Gorou and Miki's biological children, the fraternal twins Karen and Tsukihi, who are three years younger than Issei and view him as their real older brother as time goes by. 

. Issei also grows close to Gorou's consort Irisivel von Einzbern, a German noblewoman with white hair, a large bust and red eyes, and Irisivel's children, the twins Illya and Chloe. He also develops a close relationship with Irisivel's maids Sella and Leysritt, whom all the children view as their eccentric older sisters.

. He also grows close to his adoptive older cousin Irina Shidou, although he is saddened when she has to leave with her family to England. 

. On a family trip to Kamakura, Issei meets Momoyo, and the two become fast friends despite their vast age difference. Momoyo senses Issei's familar chakra and is surprised that he has her mother's friend Kushina as well as the Nine Tails inside of him, but she keeps this suspicion to herself.

. Issei also meets the shy and reclusive, blue haired and red-eyed girl Miyako Shiina, who is actually the daughter of Gendo Ikari and his wife Yui Ayanami created as a weapon to pilot the experimental EVA Unit mechs, Rei Ayanami, and the two become fast friends. Unfortunately, Miyako/Rei is discovered by some of Gendo's thugs and taken back to the Geofront, although she never forgets the memories of her time with Issei. 

.Karen's abilities as an ookami yokai [wolf monster] and the heiress to the Tohkasa clan prematurely awaken during the trip and as a result, she enters a form akin to a hanyou, with her wolf ears popping out of the top of her head at inappropriate times. This earns her the name "Wanko" from Momoyo, which she finds rather distasteful. 

. Tsukihi is kidnapped near the end of the trip, and the family spends 2 sleepless days worrying about her until Sella returns, holding a sleeping Tsukihi in her arms in a princess carry style with her regular bland look on her face. The local news reports that the Matou family, a local Mafia clan infamous for their strange activities, was wiped out by an unknown assailant. Issei quickly puts two and two together, but says nothing. 

. The experience changes Tsukihi, making her even more reclused and introverted than before. Her hair turns a bright purple, and she cuts it in a short bowl cut after recovering enough to leave the hospital. She also starts wearing traditional Japanese clothes at home, constantly harassing Sella and Leysritt to teach her the arts of homemaking, which they relent and give into in the end. Surprisingly, Tsukihi is very good at this task and is praised by the two maids for her skill and diligence. 

Part 4: Adolescence

. Issei grows into a confident, charming young man, unaware of his true origins and not caring about them anyways. From elementary to middle school, he is a star student and a rather famous baseball player, which earns him the jealousy of his classmates. 

. His younger adoptive sisters Karen, Tsukihi, Illya and Chloe all have feelings for him, even though he is unaware of this and just assumes they love him a bit too dearly. 

. When Issei is a second year at Tenbi High, he catches the eye of seductive, popular English teacher Himekami Lizel. Lizel is actually the Princess of the House of Gremory, the de-facto royal family of the Underworld, Rias Gremory. Lizel under her true name of Rias, is interested in Issei due to his powerful Sacred Gear of the Red Dragon Emperor, but she finds herself falling in love with him due to his kindness and good heart. 

. One day, Issei is mistaken for his perverted friends Matsuda and Motohoma, and beaten to an inch of his life by the enraged Kendo Club in a case of mistaken identity. Lizel, seizing the opportunity, revives the young man as her Pawn, which has the unexpected result of loosening the seal and allowing his yoki, which had been building up inside of him, to finally be released and circulate through his body. 

. This, along with the fact that the reincarnation process awoke Ddraig, the legendary Welsh Dragon inside Issei's Sacred Gear, essentially reconstructs Issei into a draconic- ookami hanyou [half wolf monster]-demigod reincarnated devil hybrid, enhancing and boosting his already formidable power 100 fold. 

. Issei is surprised at his new powers when he awakens and is confused when Lizel informs him of her true identity and what he now is, but quickly adjusts to it. 

. The plot of High School DxD continues as in the canon light novels, manga and 2012-2018 anime series, with the exception of Issei defeating Riser and the Phenix heir's peerage during the Rating Game, convincing the three female Fallen Angels Raynare, Kalwarner and Millet to join his side and killing the insane priest Freed Seltzen during the attack on the church before the fight against Riser and his peerage, and Irina revealing she is a succubus during the Holy Sword search arc. 

. Issei also discovers that his younger adoptive half-sisters, the fraternal twins Illya and Chloe von Einzbern, are actually magical girls who use the Class Cards to transform and fight the supernatural monsters popping up in the city. He also discovers Illya and Chloe's best friend, the reserved but intelligent black-haired Japanese beauty Miyu Edelfelt, is also a magical girl. 

This discovery comes as a result of Rias and her peerage receiving a message from the Archduke to kill a group of Strays causing trouble, only to find Illya, Chloe and Miyu leaving the scene with the monsters dead. 

. Needless to say, Rias/Lizel is not pleased and a rivalry starts to develop between Rias, Akeno and Koneko and Illya, Chloe and Miyu over their shared love for Issei. Issei's little sisters and the female members of Rias' peerage, along with Rias herself eventually get along and start sharing Issei, although this is a long and eventual process that takes years. 

. Issei also discovers that Karen is the heiress of the Tohsaka clan of magi while Tsukihi is the heiress of the Matou clan of magi, with Karen being Illya's mentor in the magical arts when the latter awakened her powers. Issei also meets Miyu's mentor, the arrogant and bold Luvia Edelfelt. 

. During a meeting of the Gremory and Shitori peerages at the ORC clubhouse located in the old Tenbi school building, Student Council President Tsubawa Hanekawa surprises everybody by confessing her love for Issei under her true name of Souna Shitori, the heiress of the House of Shitori that rules the Underworld along with Rias' House the Gremory and the House of Phenix, in front of a shocked Rias and the Gremory Princess' stunned peerage. To everybody's shock, the female members of Hanekawa's peerage also confess their love for Issei as well after that, further increasing Issei's already large harem. 

Part 5: Idols and Challenges

. One day when going home, Issei meets a mysterious woman named Suruga Kanbaru, who is later revealed to be a famous women's college basketball player and also a well-known idol under the name of Hoshigaoka Stella. Kanbaru seems to be very familar with Issei despite them not meeting before, and teases him during their conversation about "tying the knot early with so many".

. It is later discovered that Suruga/Stella is actually Serafell Leviathan, one of the leaders of the Underworld and Hanekawa/Souna's estranged older sister. Hanekawa and Issei are revealed to be childhood friends, with a younger Hanekawa even swearing to marry Issei along with Irina when all three of them were children. This causes a considerable amount of embarrassment for both Hanekawa and Irina when this is exposed to the other girls by Serafell/Kanbaru/Stella. 

. Momoyo also reunites with Issei, and starts training him how to use his ki [physical energy] and chakra. She also falls in love with him and joins his harem. Issei and Miyako/Rei also reunite, and the blue-haired girl confesses her love for him, joining his harem as well. 

. The youngest daughter of Issei's adoptive parents Gorou and Miki, the half-kitsune [spirit fox]. half-snake god hybrid known as Sengoku Nadeko, awakens her powers as the reincarnation of the Dragon God Ophis, causing the pureblood devil Riseviem to send his minions after her. Rias, Hanekawa/Souna and Rias/Lizel along with their respective peerages are assigned to guard the precocious young girl, which causes Nadeko to develop a crush on her adoptive older brother Issei when she learns that he is Rias' Pawn and a hero in the supernatural world. 

. The fight against Riseveim is long and hard, but eventually, Issei manages to meld the power of his ookami yokai [wolf monster], devil and dragon forms into a single massive form, allowing him to destroy the madman once and for all. 

. Issei's rival, the White Dragon Emperor Vali Lucifer, is revealed to be a cute girl named Emila Hermit, and joins Issei's harem along with Nadeko and Koneko's sister, the supposed criminal Kuroka after Riseviem's fall. This causes the collapse of Khaos Brigade as many of its members refuse to accept this supposed betrayal.

Conclusion

The story ends with Issei thinking about his life, while the girls of his harem take care of their newborn babies throught the large mansion they now call home. 


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