Kiwaguro no Brynhildr

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Kuroha Neko, the one to be blamed for everything.

For 10 years, Murakami Ryouta has been tormented by the death of his childhood friend Kuroneko, whom he had been really close to. The guilt he feels because of her death had 2 effects on his psyche: motivates him to fulfill a childhood promise he made with her to show aliens do exist (at his 16 years of life, he's already third-ranked in school and is on fast track to become a NASA researcher), and left him with a deep inability to communicate and understand the opposite sex.

One day, a girl who looks exactly like Kuroneko appears before him. Her name is Kuroha Neko, and from then on, a story of horror, experiments, human communication and despair begins.

Kiwaguro no Brynhildr (in some places called Gokukoku no Brynhildr) is a manga by Okamoto Lynn, the creator of Elfen Lied. It keeps the science-fiction horror tone and massive gore of previous works.

Tropes used in Kiwaguro no Brynhildr include:

• Anime Hair: Kikako's hair is impossibly spiky.
• Arbitrary Skepticism: Ryouta can't believe Kuroha's powers are magical, despite believing in aliens. He tries to argue aliens can be real, but it seems to disregard the fact that even if aliens existed, the probability of them being on Earth for some reason are very, very low.
• Accidental Pervert: Ryouta grabbed Kuroha's boobs once by accident.
  • Unprovoked Pervert Payback: Kana insists that Ryouta wants to molest her every single time he's around; she even does this when he carries her out of a burning house.
• And I Must Scream: Milder example with Kana who is like this due to experiments -- she can only move her fingers a bit to type on her keyboard to communicate.
• Berserk Button: The quickest way for Ryouta to bleed isn't by seeing Kuroha's breasts or fight villains: is by saying Kazumi's breasts aren't that big as she says they are.
• Bilingual Bonus: The Harnessed is the button-like thing on the nape of magic users. Due to how things are transliterated to Katakana, it's easily possible to miss that the real transliteration is her nest (which gets written in the same way), an obvious reference to where resides the parasite inside the magic users' bodies.
• Bragging Theme Tune: Kuroha creates hers own in-universe.
• Break the Cutie: All the magic users come prebroken for your convenience. You could think that further breaking is on the menu and we wouldn't blame you for it, anyways.
• Brilliant But Lazy: Kogorou refused to join institutions overseas because he simply don't wants to move too much. He already considers going to Tokyo too much work.
• But Not Too Foreign: Kazumi is half-Austrian.
• Cloudcuckoolander: What almost everyone thought Kuroneko was for believing the Earth has been take over by aliens.
• Detached Sleeves/Opera Gloves: Part of Kuroha's school uniform.
• Does Not Know Her Own Strength: Kuroha injures Ryouta in an arm-wrestling match.
• Eldritch Abomination: The horrendous thing that remains when a magic user is destroyed with her Harnessed's down-left button gives all vibes of this. Might be an alien life form that parasites the magic users' bodies and gives them their powers, but this is unconfirmed.
• Elegant Gothic Lolita: Kana, complete with Princess Curls.
• Fan Service: Averted as of chapter 9, in stark contrast with previous works.
• Fate Worse Than Death: The third button on the Harnessed will cause something like that to magic users.
• Fundamentally Female Cast: All of the magic users shown until now are teenage girls.
• Gainax Bounce: Kotori, to such a point Kazumi even asks if her breasts are real.
• Gorn: Okamoto indulges in this each time more and more; just compare the post-accident Ryouta in episode 1 to the fight with Saori in chapter 9.
• Gratuitous German: Kazumi seemed to be an in-universe example, giving herself an german surname and talking german after transferring to Ryouta's school. Then subverted when she reveals she's half-austrian.
• Harem Hero Ryouta is a justified Type 1 since he's only a Muggle, though he compensates that with his sharp mind.
• I'm Dying, Please Take My MacGuffin: Akane gives Kuroha a bag and says to her to remember she's the only one who can save the world from "ruin" before dying.
• Identical Stranger: Names and appearance are similar, but Kuroha doesn't have the moles on her armpit. And, of course, Kuroneko died when she was a child, and we only see Kuroha as a teenager. Averted later when both the audience and Ryouta discover her moles just changed places in her body as she grew.
• Hair Decorations: Kazumi wears a headband.
• Laser-Guided Amnesia: Everytime Kuroha uses her powers, she loses a part of her memory.
• Leotard of Power: Saori wears one.
• Mercy Kill: Kana asks for this after the house where she and Kuroha lives burns down along with the pills they need to continue to live.
• Mind Over Matter: Kuroha isn't actually super-strong like it was implicated at first: she has telekinetic powers. It is more clear in the anime than in the manga because a certain scene where Kuroha don't seems to move but things still get crushed happen first.
• More Teeth Than the Osmond Family: The parasites that inhabit the magician's bodies.
• Mysterious Transfer Student: Kuroha's arrival sets the whole plot in motion.
• New Transfer Student: Kuroha Neko, that affirms to have magical powers.
• Person of Mass Destruction: Ryouta basically calls the trope by name when referring to Kikako, whose powers allows her to cause massive amounts of damage with an energy blast launched from the mouth.
• Photographic Memory: What makes Ryouta specially smart is his capacity to store things in his mind with uncanny precision.
• Power At A Price:
  • Kana can see the future, but is unable to move or even talk by herself.
  • Kuroneko slowly loses her memories every time she uses her powers.
• Power Incontinence: Kuroha and Kana need to eat special pills or otherwise their bodies will decay because their own powers begin to rip them apart.
• Psychic Nosebleed: Subverted, it is actually the first symptom before an horrible case of Power Incontinence begins to destroy the magician's bodies from the inside.
• Puppy Dog Eyes: Kuroha is able to use this on Ryouta just by staring at him and crying because the art style already makes her eyes big.
• Rapunzel Hair: Kotori, to the point it hides her Harness.
• Ripple-Effect-Proof Memory: Saori has this as part of her power.
• Seers: Kana is one.
• Secretly Dying: Kazumi is out of pills and slowly dying when our main protagonists contact her. That's the reason why she accepts to help them despite they having no pills: she still wants to help someone before she dies.
• Self-Fulfilling Prophecy: Averted. Predictions of the future change if the people involved change their behaviour by being informed of a prophecy.
• Set Right What Once Was Wrong:
  • Kana's powers allow that to happen if she informs someone that can alter it of it.
  • Saori's power to turn back time also allows it, though she can't revert the consumption of magic of using this power.
• Shameless Fanservice Girl: Kazumi tempts and then makes Ryouta sees her bare breasts without a care in the world.
• Spoiler Opening: The manga begins with Kuroha bleeding on the floor and Ryouta stabbing her, screaming "If only you didn't exist.. If only you have stayed dead!". All of this in a desolated and annihilated landscape, with the shadow of a girl watching the scene the only extra detail. Knowing the author, this can't possibly end well.
• Take My Hand: Kuroneko grabs Ryouta's hand when he falls off a ledge in the beginning of the manga. It don't works like intended and both kids fall off dozens of meters.
• Tall, Dark and Bishoujo: Kuroha has traces of this (she only lacks the tall part a bit).
• Techno Babble: Ryouta's explanation of RSA leaves a lot to be desired.
• Technopathy: Kazumi's magical power is to...operate electronic machines with her mind.
• Teleporters and Transporters: Kotori has that power, allowing her to change places with another person, but immediately drains her of all her magic.
• The Ace: At least intellectually. Ryouta is the best student in his school and third-best in Japan.
• The Conspiracy: The main villains are of this kind.
• The Dreaded: Kikako is an AA+ magician who sets the other magicians in fear just by hearing her name.
• The Masquerade: Enforced to such a point that heroes can benefit from it because the mysterious organization that creates magicians don't would dare to make a move who could risk the masquerade's existence.
• The Needs of the Many: Kuroha says to Ryouta to not leave the observatory after he decides to not miss the bus because if he did ride the bus, a lot of more people would die from a failing boulder that if he just walked to his destiny.
• Time Master: Saori's second power is to revert time back for one minute.
• The Omniscient Council of Vagueness: The organization behind the magicians is leaded by one.
• Transfer Student Uniforms:
  • Because Kuroha never attended school, she wears a self-made uniform (see page image).
  • Kazumi's uniform consists of clothes she found at the abandoned village.
• Truth in Television: In chapter 6, it's revealed that Kazumi's magic is her capability to factor very large integers with ease, and that makes her capable of breaking security of many systems. Then again, the explanation and theory exposed in the chapter would make mathematicians and cryptographers cringe.
• Undead Tax Exemption: Kuroha can only attend school because she knows a very skillful hacker.
• You Gotta Have Blue Hair:
  • Kuroha's hair is either dark blue or Shiny Midnight Black while Ryouta's hair is light green.
  • Kazumi's hair is pink in the anime.
• You Have Outlived Your Usefulness: Happens with several magicians once the organization no longer needs them.
• Zettai Ryouiki: Kuroha wears thigh-high black stockings to a short dress as her school uniform. Class B.