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Fanfic / Fate/stay night: The Dragon of the Seventh Heaven

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Fate/stay night: The Dragon of the Seventh Heaven is an Alternate Universe Crossover between Fate/stay night and High School D×D written by Starlight's Poet.

Issei Hyoudou was always normal. And a pervert. The odds of him ever finding a girl were slim. So when Yuuma Amano approached him, there were no words that could describe the happy feeling in his heart.

And then she attempted to kill him, revealing her true nature.

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At that moment, however, Issei's desperate pleas for someone to save him woke something inside of him. A secret that he was not aware of. Something that a certain vampiric troll is watching with great enthusiasm.

As for Raynare...the last thing she could have expected was to find Tamamo-no-Mae before her, proclaiming Issei Hyoudou her husband and ready to kill her.

This story contains examples of the following Tropes:

  • Accidental Marriage: What Issei's summoning of Tamamo essentially counts as. Not that Issei is complaining.
  • Action Girlfriend: Or Action Wife as Tamamo would claim, regardless of whether or not she was summoned as a Heroic Spirit or a Servant. Plus, she sees the summoning as a marriage to Issei.
  • Adaptational Badass: Tamamo, if you can believe it. All variants of Tamamo-no-Mae are fragments of the actual character, known as the Tamamo Nine, and each wants to become the true Tamamo-no-Mae. Thanks to Issei reviving Tamamo-no-Mae via Heaven's Feel, the Tamamo Nine have been gathered, thus unlike in Fate/EXTRA, she's at full power constantly. Meaning she can trounce virtually almost anyone easily, except perhaps barring the likes of Great Red or Trihexa.
  • Adaptational Early Appearance:
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    • Kunou and her mother Yasaka originally debuted in DxD Volume 9. Here, they appear during the events of the Holy Maiden Arc, discussing the revival of Tamamo-no-Mae.
    • Lint Sellzan. She first appeared in Volume 22 in the main series. Here, she's with the Stray Exorcists tasked with stealing Asia's Sacred Gear and killing Issei.
  • Adaptational Wimp: In the light novels, Issei, even early on when he became a Devil, could hold his own in a fight on account of his newfound durability. In the fanfic, he's still human so he isn't nearly as strong or as durable to take on supernatural beings like the Fallen Angels at the moment. On a more humorous note, Issei's perversity has also been toned down. In the light novels, he was a pervert of epic proportions to the point where he could loudly declare it to the world at times. Here, he's utterly whipped by Tamamo, though a major reason why his perversity is watered down is namely because the poor guy is terrified of her Harem Castration Fist, something that Zelretch warns him about.
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  • Adapted Out: The Riser Arc is not going to be featured in the story, or at the very least is going to be postponed, as the Arc following the Holy Maiden storyline focuses on the ramifications of Issei reviving one of the most prominent figures in Shinto myth.
  • Admiring the Abomination: Nothing could possibly play this trope straighter than Issei finding Fou, A.K.A. Primate Murder adorable.
  • Agony of the Feet: When an oni crashes into the onsen Aika and her family are staying in, she is forced to run away naked. During their escape, she steps on some broken glass and cuts her foot open, prompting Issei to carry her.
  • Ambiguously Human: In Chapter 6, it was stated by Zelretch that, due to the boundaries between Issei's world and Zelretch's own being weakened a la Goetia and the Alien God's actions, Issei managed to establish a connection with the Root and has become something more than human.
  • Ambiguous Situation: In Chapter 7, shortly after Issei informs Tamamo that Asia is dying, Tamamo has a conversation with the Nine. Near the end of the conversation, the Tamamo in charge orders her Shark, Cat and Tamamo-vitch selves to go help the others restrain her. It's unknown who she is referring to, but given that Tamamo is technically a Beast, it's possible she has her other seven aspects working to keep the Beast variant under check.
  • Ascended Extra:
    • Issei's classmate Aika Kiryu ends up getting dragged into his adventures and learning about the supernatural.
    • Lint Sellzan also somewhat applies. She was introduced fairly late into the light novels (she was introduced in Volume 22, four books shy of the "True" Light Novel books), but here she has a more prominent role as one of the Stray Exorcists asked to kill Issei. She later accepts Rias' offer to become a member of Peerage, taking Issei's place as her Pawn.
  • Back from the Dead: If you're familiar with the magical lore of the Nasuverse, then you'll remember that Heaven's Feel is the power to revive a deceased soul without any negative consequences. In an AN , the reason why Issei has Heaven's Feel is because of the events of Fate/Grand Order have weakened the boundaries between universes, with the Nasuverse's influence leaking into DxD's. Additionally, because he summons Heroic Spirits, the individuals in question are revived at full power, rather than being limited to a specific skillset that their Servant body and Class forces on them.
    • Tamamo is the first Heroic Spirit summoned, due to Issei thinking about his ideal girlfriend and wishing someone would save him before he's killed by Raynare.
    • Issei himself undergoes this when he's shot and killed by Freed. The Heaven's Feel constructs a new body for him after his old one died. Hilariously, he was Naked on Revival. Not so hilariously, he's shown his dead body shortly after, which freaks him out.
    • Jeanne d'Arc follows Tamamo when Issei Rages Against the Heavens before he breaks down and tearfully begs Him to save Asia as she is about to die after the botched attempt from having her Sacred Gear removed.
    • According to Word of God, the next Heroic Spirits to be revived are Musashi, who will act as Issei's teacher, and Frankenstein's Monster, whose role has yet to be revealed.
  • Badass Normal: What the author claims Issei will be. Starlight's Poet, the author, promised that he wouldn't remain weak and the constant Distressed Dude while being coddled. Makes sense, as compared to everyone else, who is a supernatural being, Issei is still a normal human who does not have a Sacred Gear in this story. Word of God even states that his teacher will be Musashi, who is stated to be summoned next after the next arc is complete.
  • Beware the Nice Ones: Tamamo may be all smiles, but she is the Avatar of Amaterasu-no-Mikoto for a reason. Rias, Sona, and co. learned that the hard way. And Issei fears what may happen if he ever tries to mention having a harem before her, fully aware that she does not like the idea of sharing.
  • Berserk Button: For the author. People constantly sending him suggestions on what Heroic Spirits he should summon is enough to tick him off.
  • Brought Down to Normal: By ripping off Raynare's wings – the symbol of her power – Tamamo effectively rendered her to the level of the average human being. It's also played as being a Fate Worse than Death, as Raynare is now on the same level as the creatures she detests so much.
  • Came Back Strong: What Issei's Heaven's Feel does for Heroic Spirits. Rather than being summoned as Servants, and therefore having their powers limited to a Class-specific loadout, they're summoned at their peek when they were alive and have all their various powers accessible.
  • Cassandra Truth: A Youkai faction led by Jorogumo wants to kill Issei because they think he is lying about having summoned Tamamo. Zigzagged in that she is partially correct, as Issei revived the Nasuverse's iteration of Tamamo instead of his world's version.
  • Chekhov's Gun: The deck that Issei received the day before his date with Raynare turned out to be quite important, as it seems to act as a sort of tool for Issei to use when using the Heaven's Feel. Case in point, when he's about to be killed by Raynare and he summons Tamamo, or when he has a Rage Against the Heavens moment and his desperation for someone to save Asia summons Jeanne d'Arc, both times in which he had the deck present.
  • Clingy Jealous Girl: Issei gets the feeling that Tamamo is this, and at one point envisions her giving a spiel of how while gods may approve of harems, it will be a cold day in hell before she does.
  • Cruel Mercy: When discussing the idea of Asia becoming an Reincarnated Devil, Sona refers to Jeanne d'Arc, who had been branded a witch, later becoming recognized by the church as a saint. Though it occurred long after her death, Jeanne was welcomed by the church. Theoretically, Asia also has this chance. If she becomes a Devil, however, that opportunity will disappear, and Asia will remain a heretic in the eyes of the church. Asia ultimately chooses to endure that exile by leaving behind a letter requesting Rias resurrect her after her death.
  • Cuteness Proximity:
    • Almost everyone thinks that Asia is adorable, which is why Tamamo does not mind her hanging out with Issei.
    • Issei and Asia think that Fou is adorable. Tamamo and the Devils are terrified of the creature and find it ironic that those two cannot sense Fou's true nature.
    • This is Aika and Issei's reaction upon meeting Kunou. Her speaking in third person makes Issei feel as though he's going to die of sugar and spice due to how overwhelmingly cute it is.
  • Dramatic Irony: No one is aware yet that this Tamamo is from another universe. Not even Tamamo herself. But Zelretch does.
  • Eldritch Abomination: Fou. There's a reason it's called Primate Murder.
  • Fantastic Racism:
    • Like in canon, Raynare leads a faction of Fallen Angels who hate both Devils and humans.
    • Jorogumo leads a faction of Youkai who hate humans, and she hates Yasaka because she likes humans and it is rumored her daughter Kunou's father is a human.
  • Fate Worse than Death: What Tamamo believes to be Raynare's fate after defeating her. With her wings ripped from her back, she has virtually been stripped of all of her power as a Fallen Angel, and is now reduced to the level of a human, the same beings that she detests so much.
  • Fish out of Temporal Water: Since there is no Holy Grail to provide her with information, Tamamo doesn't know anything about the modern world and needs Issei or others to explain things to her like schools. Much to the Devils' surprise, she doesn't even know about modern magical terms like Sacred Gears, of the three-way war between Angels, Fallen Angels, and Devils, or of the current state of the Youkai, but this is understandable because Tamamo is from the Nasuverse where these terms and events do not exist.
  • Foreshadowing: In Chapter 9, Aika mentions to Issei that she has been having unusual dreams involving fire and something with green eyes staring back at her. And as it just so happens, the wielder of Boosted Gear has yet to be accounted for...
  • Freak Out: The Devils and Tamamo of all people have one when they see Fou, one of the Beasts of Gaia and the infamous Primate Murder on Issei's shoulder.
  • God in Human Form: Tamamo-no-Mae. She is the avatar of the Japanese goddess of the sun, after all.
  • The Great Political Mess Up: Tamamo clearly is not happy with the fact that Devils have established themselves in Japan. In fact, when she first hears of it, she goes ballistic.
  • Guardian Entity: An internal monologue reveals Fou was summoned to protect Issei.
  • Happily Adopted: Asia. In exchange for sparing the Fallen Angels that had gone against orders, Issei asks Azazel to help him make adoption papers for her. His parents wholeheartedly agree to the idea, and while it will take some time for the papers to be processed, Asia is now effectively Issei's little sister.
  • How Do I Shot Web?: Issei has no idea how to activate Heaven's Feel at will. Based on what little we've seen him use it, plus Word of God in Chapter 7, Issei needs to be in a situation and say certain keywords that will trigger the Heaven's Feel and garner the attention of a Heroic Spirit, though judging by the wordingnote  the decision of whether or not the Heroic Spirit will manifest is ultimately up to the Heroic Spirit itself.
  • Identity Impersonator: Issei introduces Tamamo to his parents as Yuma Amano, a.k.a. Raynare's human alias.
  • Info Dump: Zelretch explains the Heaven's Feel to Issei and its applications, though most of it goes over his head.
  • In Spite of a Nail: Despite many factors being present, such as Issei possessing Heaven's Feel, which can revive anyone without consequence, Asia still dies and is Reincarnated by Rias. At that point in time, Issei still doesn't fully understand how to use the Heaven's Feel, or that it has rules in place for it to be used.
  • Kansai Regional Accent: Amaterasu speaks in an Osakan accent, something that throws Issei and Aika for a loop. It's also a Genius Bonus considering that Amaterasu's major center of worship is near Kansai.
  • Killed Off for Real: Freed, courtesy of Issei chopping off his head.
  • Late-Arrival Spoiler: Anyone who hasn't reached the end of the first act of Fate/Grand Order will be shocked to learn that the tiny white fluffy ball of cuteness that is Fou is, in actuality, one of the Beasts of Gaia – specifically the one designed to kill humans exceptionally well.
  • Mind Hive: Since Tamamo was revived in full, rather than in the body of a Servant, the Tamamo Nine are all sharing the same body, with the Caster Servant aspect being the dominant persona in control. That said, Tamamo-vitch implies that any of the Nine can take the driver's seat.
  • Mistaken for Cheating: When Issei ends up summoning Jeanne d'Arc, Tamamo angrily jumps to the conclusion that he's cheating on her, his wife! Fortunately, Jeanne quickly diffuses the situation, clarifying she is not interested in Issei and simply came to help him.
  • Mistaken for Gay: Jealous of Issei's relationship with Tamamo, Matsuda and Motohama start spreading rumors that he is gay when they see him hanging out with Kiba.
  • Mistaken Identity:
    • Several of the supernatural factions think that Tamamo is the DxD verse's own Tamamo. Some don't believe it, however, because the Killing Stone – DxD Tamamo's resting place – is still intact; but the evidence before them still indicates that this is Tamamo-no-Mae who was summoned forth by Issei.
    • Due to how "holy" Jeanne feels, and despite her saying otherwise, Asia believes that Jeanne is secretly an angel and calls her "Angel-sama", much to her embarrassment.
  • My God, What Have I Done?: Subverted. Issei himself remarks how strangely it feels by the fact that he wasn't shocked or horrified by the fact that he chopped off Freed's head. Even when he looks back on the incident, he doesn't feel anything except worry by the fact that he didn't feel anything except joy. This is acknowledged by the author, who claims that Issei not having any first-kill jitters has to do with the fact that he's a descendant of an as-of-yet named historical figure.
  • Mythology Gag:
    • When Issei gives Tamamo a tour of his school, Tamamo says the school environment seems vaguely familiar somehow, a reference to the high-school setting of Fate/EXTRA.
    • Zelretch, when explaining things to Issei in their meeting, mentions an event in one of his dimension's parallel worlds that resulted in human history being incinerated and a cataclysmic event, referring to the events of Fate/Grand Order.
  • Nosebleed: Issei tends to get these when Tamamo's seductive antics push him too far. They even knock him out, much to his frustration.
  • Not-So-Imaginary Friend: Fou starts appearing in Issei's dreams, which he thinks is strange but doesn't think much off. Imagine his surprise when he appears in reality and the others can see him.
  • Off with His Head!: How Freed goes out. Issei chops off his arm to prevent him from fighting back, then proceeds to lop off his head. Toyohisa would be impressed!
  • Oh, Crap!: Several.
    • In Chapter 1, when Raynare's attempt to kill Issei fails thanks to him inadvertently summoning Tamamo-no-Mae. And Raynare promptly receives this beautiful gem:
      Tamamo: Prepare to die, bitch.
    • Another one happens in Chapter 2, when the Devils of Kuoh confront Issei and Tamamo, with the latter becoming furious that the Devils had the audacity to claim a part of Japan as their own. The Devils realize they have pissed off a being who could very easily kill them all – Rias in particular, for how she brought it up.
    • In Chapter 6, the Devils and Tamamo especially, upon meeting Fou, quickly realize that it is more than it seems. Kiba in particular realizes how dangerous it is and advises Issei to get away from it. Issei, possibly due to his human nature, is the only one who doesn't realize he's holding the freaking Beast of Gaea Primate Murder like it's a pet.
    • In Chapter 9, upon hearing that Issei is going to meet with not just Yasaka, but also Amaterasu, Tamamo flips out and rushes to Kyoto to save Issei. While DxD's Amaterasu's personality is unknown at present, Tamamo has every right to be afraid considering what the Amaterasu of Nasuverse is like.
  • Pint-Sized Powerhouse: Despite being the size of a small dog, Fou can effortlessly overpower people like Tamamo.
  • Powerful and Helpless: Tamamo realizes she never learned any healing spells, so for all her godly power and seven Class aspects, she can't do anything to save Asia from the damage to her soul, leaving reincarnation as a Devil as the nun's only option. Issei possesses Heaven's Feel, but since he is still figuring out its kinks, has no idea how to use it to heal Asia. In his Rage Against the Heavens, Issei ends up summoning Jeanne d'Arc. Although she doesn't have any healing powers either, Jeanne comforts Asia, and convinces her that becoming a Devil won't mean betraying God.
  • Rage Against the Heavens: Issei angrily rants against God for the fact that Asia is dying from irreversible damage to her human soul, plus everything Asia suffered in her life. Fortunately, this activates Heaven's Feel and summons Jeanne d'Arc. While Jeanne lacks the ability to heal Asia, she manages to soothe her and convince her that reincarnating as a Devil – something that Asia had been reluctant to do – will not be a betrayal of God.
  • Reality Ensues: After Lint Sellzan joins Rias' peerage, Rias is eager to enroll her in the school, thinking she would look good in the uniform. Much to Rias' chagrin, Sona points out this would be impossible because she looks too old to be a student, and she can't be a teacher because she knows nothing about any of the curriculum.
  • Really 700 Years Old: According to Azazel, humans with incredible innate magical potential can potentially allow them to live far past the average human lifespan, though humans who make a contract with a Devil to increase their magical prowess rather than refine it themselves will lose the bonus years. Morgan Le Fay, King Arthur's sister, lived for eight centuries. And if what Azazel says is true, then Issei can live to be a million years old.
  • Red Baron: Issei is referred to as the "Root's Link" by Fou, due to his connection with the Root.
  • Royal "We": Invoked by Tamamo, when all members of the Tamamo Nine agree on something. Usually doubles as an Oh, Crap! moment, because when you hear Tamamo talking like that, you know you're screwed.
  • RPG-Mechanics Verse: Sort of. The story's setting isn't remotely like that of a Video Game, but the Heaven's Feel seems to work like this, based on text appearing as follows:
    {{Error. Connection lost.}}
    {{Attempting reconnection...}}
    {{Error! Reconnection impossible. Cause: Severe Brain Injury.}}
    {{Odds of survival: zero.}}
    {{Opening Circuit Pathways...}}
    {{Circuit Connection Established.}
    {{Beginning Reconstruction.}}
  • Sex Slave: As her way of apologizing to Issei for her role in Asia's kidnapping and death, as well as his own, and realizing that words won't do much good, Lint offers Issei her body as way of atonement. Any other time, Issei would have been ecstatic by the prospect, but is so whipped by Tamamo that he's more scared of what Tamamo might do if she ever learned that Lint even made the offer!
  • Shout-Out:
    • Issei dreams of being in what can only be described as a Station of Awakening knock-off, complete with a stained glass mural for a floor and a door of heavy significance.
    • In Chapter 9, Issei and Aika crash into a cabbage stand, then a man yells, "My cabbages!"
    • Amaterasu, when introduced in Chapter 9, is shown wearing a Dark Souls shirt with Solaire of Astora in his famed "Praise the sun!" pose, complete with the caption at the bottom.
  • Spared by the Adaptation:
    • In a sense. Tamamo is summoned in time to stop Raynare from killing Issei, so he remains a human instead of being reincarnated as a Devil by Rias.
    • The Fallen Angels, by virtue of Issei sparing them in exchange for Azazel helping him set up Asia's adoption papers. Raynare, however, is inflicted with a Fate Worse than Death as Tamamo burned and ripped off her wings, effectively weakening her to the point she's only barely more powerful than a human by virtue of her being a Fallen Angel.
  • Speaks Fluent Animal: Tamamo can understand what Fou says, while Issei can't.
  • Superpower Lottery: Issei has Heaven's Feel. Let us repeat: Issei. Has. Heaven's Feel. Granted, the logical drawback is that even with some information from Zelretch, Issei has no idea how to use this magic at all. He only managed to summon Tamamo and Jeanne through circumstances bringing thoughts that fit their descriptions into his head.
  • Tempting Fate: Issei invokes Murphy's Law after he lands in a bathhouse, having recently been kidnapped by a Tengu belonging to the Youkai Faction and realizes that they want to talk with him in regards to him resurrecting Tamamo-no-Mae.
    Issei: (Thinking) This couldn't possibly get any worse.
    (cue Oni arriving in the batthouse)
    Oni: Alright, you jabronies! Which one of ya is that damned onmyouji who cares claim he resurrected Tamamo-no-Mae-sama?!
    Issei: Fuck. My. Life.
  • You Have Failed Me: Jorogumo, the leader of a splinter cell of the Youkai Faction, kills a yurei and oni for having failed to kill Issei upon his arrival in Kyoto before deciding to do the job herself.
  • Zettai Ryouiki: A few female students have this, such as Aika. Special mentions go to Tamamo, however, who has Grade B.

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