''Dra+Koi'' is a very short visual novel by Nitroplus about a dragon that attacks a city, gets knocked down by a mysterious dragonslayer and turns herself into a human in order to recover. She comes across the hero of the story and attempts to eat him, but he fends her off and escapes homeward. The next day, she transfers into his class and declares her love for him, chases him down and forces him into a relationship.

''Dra+Koi'' is a visual novel with a very silly atmosphere (most of the time) and an odd fondness for metafiction. The cast is very small, the story is short and is at least as interested in talking about stories as it is about the characters, all of whom go unnamed.

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'''This visual novel provides examples of:'''

* AlienBlood: Dragons bleed gold.
* [[spoiler:AnimatedArmor: The Dragonslayer turns out to be this.]]
* AntiHero: The dragonslayer is completely unconcerned about any damages caused and only wishes to destroy the dragon.
* BlackKnight: The dragonslayer is covered in black armor with glowing red eyes and a lightsaber. [[spoiler:It's really just a suit of armor.]]
** [[spoiler:The Protagonist wears him later on.]]
* BloodyMurder: The dragon can alter its blood to be corrosive.
* BlueAndOrangeMorality: The hero repeatedly notes that, for all that they have a weird but semi-functional relationship, the way dragons think is just ''off'' compared to the way humans do.
* BreathWeapon: Naturally, a dragon has breath attacks, but she still launches them in human form, at which point her eyes glow and she grows fangs.
* CurbStompBattle: The dragon stomps all over mundane weaponry. The dragonslayer stomps all over her in turn.
* CuteLittleFangs: The dragon in her human form, so long as she's not fire beams. Eventually, her beam firing form also has mere CuteLittleFangs rather than the massive set of teeth she showed before.
* DangerouslyShortSkirt: The dragon's skirt is so short that it's questionable if it even covers her butt.
* DestructiveSavior: The dragonslayer causes immense damage to the area while fighting the dragon.
* DidYouJustRomanceCthulhu: Dragons are undefeatable except through fantasy and break the laws of physics much like an EldritchAbomination would. This is a love story. Do the math.
* TheDragonslayer: A knight clad in black shows up to fight the dragon because that's what it does. [[spoiler:It's actually just the hero's armor. The protagonist is the dragonslayer.]]
* EmpathicWeapon / EvilWeapon: [[spoiler:The black armor. Just wearing it causes the hero to experience a periodic compulsion to [[MadnessMantra Slay the dragon]]. It's implied that the armor is animated by the souls of previous dragon slayers, who periodically vote on its course of action.]]
* FantasticallyIndifferent: When the dragon shows up in the protagonist's class and begins firing beams, nobody really cares. Justified, in that this sort of thing happens about once a year, so a dragon entering a school may not be all that impossible.
* FreudWasRight: When [[spoiler:the hero fights the dragon]], she describes the act of plunging his hard, powerful sword deep into her quivering flesh in even less subtle terms than those.
* GagSeries: The story starts out looking serious: A dragon attacks a city and is intercepted by a badass knight in black armor. Then the dragon becomes infatuated with a student and runs around blowing up the school before catching and raping him, at which point it becomes a romantic comedy. Guys in powered armored suits join the family at breakfast.
* GenreSavvy: The protagonist is pretty aware of how things go in stories.
** "I'm not some hero, I'm just a kid. There's no magical plot device that will come save me."
** He also reflects that normally he'd probably hit her boobs on accident and romantic comedy ensues, but instead tears a hole through her throat. It turns out that this is actually pretty much exactly what he did: the dragon couldn't care less about her breasts, but the scale he touched on her neck is special.
* GlowingEyesOfDoom
** Glowing red eyes show through the visor of the dragonslayer armor.
** The dragon has glowing turquoise eyes when firing beams.
* HealingFactor: The dragon, the wearer of the armor and the armor itself all heal rather quickly.
* HellishPupils: The dragon in human form has slitted reptilian eyes.
* ImmuneToBullets: Firing bullets at the dragon does nothing. Nor missiles or tank shells.
* IncestSubtext: The protagonist's mother rather openly lusts for him.
* InterspeciesRomance: Dra Koi is a love story between a dragon girl and a human.
* KnightOfCerebus: The dragon slayer. Literally.
* {{Leitmotif}}: The dragon slayer's is a wicked metal piece that evokes menace. The protagonist's mother gets one that seems to be a military chant of moe items, like meganekko, tsundere and goth loli. Moe, moe, moe moe moe!
* LoveAtFirstPunch: The dragon falls for the protagonist when he lands a blow on her 'reverse scale.'
* MadLove: The dragon follows the protagonist around declaring her love before trapping him on the roof of the school and more or less raping him. An uneasy relationship starts up after that. [[spoiler:It's implied that all dragon slayers fall in love with the dragons they are destined to kill.]]
* MadScientist: The first dragon was beaten when a mad scientist invented an ether destroying device. [[spoiler:To fulfill the Romance, he then destroyed it and committed suicide, turning it into Fantasy.]]
* MagicalEye: Dragon eyes are enchanting. [[spoiler:Not really, probably. He just fell in love with her on his own.]]
* MetaFiction: Dragons are always dead by the end of the story, wounds aren't fatal until the story says that they're fatal and only a suitably fitting method can beat a fantasy threat. Dragons attack humans because that's just what dragons do. Heroes destroy dragons because that's what they do. Then the story is complete. Or rather, the romance.
* MoodWhiplash: The story is very fast paced and will instantly switch from dates to fights to the death to breakfast scenes.
* MoreTeethThanTheOsmondFamily: When firing beams, the dragon girl's mouth sprouts numerous, massive fangs.
* MorphicResonance: The dragon keeps her eyes, teeth, and reverse scale in her human form.
* MultipleEndings: There are four endings: Two of them bad ends acquired before the climax, one is the good end and finally there's one that's also a bad end, but still completes the story as fully as the good end does.
** At the end, if you choose Faithful, [[spoiler:the hero slays the dragon without telling her he loved her. The story reveals that the mad dragon's fall was because of love. You're being faithful to the story, not the girl. You also get this ending if you protect her both times, but don't go on the date with her.]]
** If you instead choose Unfaithful [[spoiler:the protagonist says that this whole thing is stupid, attacks her 'reverse scale' like before, but this time he turns her into the hero's reward: A princess. You're being unfaithful to the story, not the girl.]]
** If you don't protect her the first time, the dragonslayer simply kills her.
** If you refuse to [[spoiler:attack the armor and save the dragon after protecting her the first time, the armor declares the protagonist unfit to be the hero, kills him and goes to find a new hero]].
* MundaneFantastic: "Oh, another dragon showed up huh? What a pain. I hope the stupid SDF takes care of this quickly."
* NamelessNarrative: Nobody in the story gets a name. There's the protagonist, the dragon, the dragon slayer, the protagonist's mother and then minor things like the guys in armor.
* NighInvulnerable: Only Fantasy can defeat Fantasy, so normal weaponry doesn't affect the dragon.
* NewTransferStudent: The dragon enters the protagonist's class apparently just to fulfill the cliché.
* OlderThanTheyLook: The protagonist's mother is an adult woman that looks younger than her son apart from her slouch and smoking.
* OnlySaneMan: The protagonist is the only normal person in the cast. His mother lusts for him, his classmates are stereotypical to the point of being insane, the dragon is a dragon and thinks differently from normal humans, and the soldiers join them at breakfast in their PoweredArmor for some reason.
* OurDragonsAreDifferent: Dragons are nigh invulnerable and capable of destroying a city on their own in moments. [[spoiler:That's because only Fantasy can defeat a Fantasy, so when a Hero shows up they're guaranteed to lose.]]
* ParentsWalkInAtTheWorstTime: The mother walks in on the pair having sex the second time. As well as the aftermath of the first time, to say that the mother was angry would be an understatement.
* PoweredArmor: The JSDF has some suits, but the technology's still rather primitive, and they are frequenly derisively referred to as "metal gorillas." [[spoiler:The dragon slayer's armor, on the other hand, is [[MagiTek much more advanced]].]]
* RedEyesTakeWarning: The eyes of the dragonslayer glow bright red.
* SayItWithHearts: In the middle of a smoker's cough, the protagonist's mother has a little heart in her mouth.
* ShoutOut
** The dragon estimates the protagonist's [[DragonBallZ power level to be five.]]
** VisualNovel/{{Demonbane}} is the kind of fantasy that beats a dragon.
* SirSwearsALot: The protagonist was translated as being rather foul mouthed in order to get across his aggressive attitude.
* SlasherSmile: The dragon's main smile is a grin that the protagonist really doesn't like. It's aggressive and reptilian looking.
* SleepModeSize: The dragon turns herself into a human at the beginning to regain her power.
* StalkerWithACrush: The dragon follows the protagonist every, enters his school and even moves into his house. Who's going to stop her? [[spoiler:This is part and parcel of the natural all urge dragons feel to ''connect'', and they cannot separate the idea of loving someone from wanting to either kill or devour them.]]
* StandardHeroReward: Discussed. The hero is supposed to slay the dragon and then get his princess as a reward. [[spoiler:In the good ending, the protagonist decides to turn the dragon into the princess and end the story like that instead.]]
* TechnicolorEyes: The protagonist and his mother have purple eyes. The dragon's eyes are a bright turquoise color.
* {{Tsundere}}: The protagonist protests the dragon's actions a lot, but he seems fond of her in his own way [[spoiler:and doesn't seem to like the idea of fighting her to the death.]]
* UrbanFantasy: The story takes place in a city that is attacked by dragons about once a year.
* WouldHitAGirl: The protagonist gets in a fight with the dragon at the beginning and blows a hole in her neck to end the fight. She shows up the next day anyway.
* YouGottaHaveBlueHair: The protagonist's hair is a whitish shade and the dragon has pink hair. His MOTHER, however, does have blue hair.
* ZettaiRyouiki: The dragon wears very long stockings.
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