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Haiyore! Nyaruko-san (這いよれ! ニャル子さん?) (The Crawling Nyarlko) is a Japanese light novel series written by Manta Aisora with illustrations by Koin, inspired by H. P. Lovecraft's Cthulhu mythos.

Seven volumes have been published by Soft Bank Creative under their GA Bunko imprint. A flash original video animation (OVA) by DLE titled Haiyoru! Nyaruani was published in between October 2009 and March 2010.

A Flash Anime television series by DLE, Haiyoru! Nyaruani: Remember My Mr. Lovecraft, aired in Japan between December 2010 and February 2011.

A television anime series by Xebec began airing in April 2012.
Two manga adaptations have been produced.

Plot

The story of Haiyore! Nyaruko-san centers around Nyaruko, a formless Cthulhu deity of chaos (Nyarlathotep) who can take on the shape of a seemingly ordinary silver-haired girl. Mahiro Yasaka is a normal high school boy who is chased by aliens one night, until Nyaruko saves him.

Characters
Human characters

Mahiro Yasaka (八坂真尋 Yasaka Mahiro?)
Voiced by: Eri Kitamura
A human boy who reluctantly finds himself under the protection of Nyaruko. He tends to attack aliens by stabbing or throwing forks whenever they make him angry. He appears to attack so fast that currently no alien has able to dodge yet. At first he dislikes aliens and wants to kick them out, but as the the story progresses he starts to become more tolerant toward their actions. He is attracted to Nyaruko (her human form being specifically tailored to his tastes), but dismisses her advances as he believes nothing good would come of such a relationship.

Yoriko Yasaka (八坂頼子 Yasaka Yoriko?)
Voiced by: Kikuko Inoue (Drama CD), Aya Hisakawa (2nd season anime)
Yasaka Mahiro's mother, a real monster hunter who started her career during college. She has a young appearance that makes it hard to believe that she has a son in high school. She conceals her true job from her son until returning home during the plot. She is kind to friendly aliens, accepting Nyaruko, Kūko, and Hasuta living in the house, and their actions to pursue Mahiro. However, she advises Nyaruko to take her relationship with Mahiro a bit slower. She uses a throwing fork as her weapon in hunting monsters, and appears to be better skilled and can carry more forks than her son. She is obsessed with video games, buying different game machines whenever she returns home from hunting. She also has a habit of hugging Mahiro, claiming she's replenishing her "sononium."

Alien characters

Nyarlathotep (ニャルラトホテプ Nyaruratohotepu?) / Nyaruko (ニャル子?)
Voiced by: Kana Asumi
A Nyarlathotepan (alien from Nyarlathotep) who is sent by Space Defence Agency to Earth to protect Mahiro Yasaka and ends up falling in love with him. She takes a human form of silver long-haired girl. She is always friendly to Mahiro, eager to pursue him; but often shows abusive and brutal habits to any hostile aliens. She is also obsessed with otaku culture. She takes the name Nyaruko Yasaka as Mahiro's cousin when staying at Mahiro's house and going to school. Her age is unknown since she and Kūko will stop Mahiro whenever he becomes curious or doubting with her age, although she states that she has already graduated from space college. She is also known to be smart and self-confident, as she graduated from one of the best universities in space at the top of her class, and entering the Space Defence Agency by exam. As a top agent, she mainly uses space CQC to fight (note that the definition of "space CQC" is defined by the user and is not restricted to close quarter combat weapons).

Cthugha (クトゥグア Kutugua?) / Kūko (クー子?)
Voiced by: Miyu Matsuki
A female Cthughan (alien from Cthugha). She takes a form of slender, red-haired girl. She is in love with Nyaruko despite her race is the archnemesis of nyarlathotepians. She transfers to Mahiro's school and takes the name Kūko Yasaka, Nyaruko's "wife". At first she is hostile toward Mahiro, but as the story progress, she become more friendly, and changed her goal to consist a family with both Mahiro and Nyaruko. She is also obsessed with otaku culture. Kūko was Nyaruko and Hasuta's space elementary school classmate ans appears to at the same age of them, although she became a NEET after graduating from high school, and become a Space Defence Agency agent later by using the relationship of her uncle who is an employee in Space Defence Agency. She concealed her feeling of Nyaruko to her family, since love between Nyarlathotep and Cthugha are referred to as shame of the family among Cthughans. She possess the power of fire, able to control fireballs, heat, or drones that firing laser, she refer them as space CQC - Cthugha version.

Hastur (ハスター Hasutā?) / Hasuta (ハス太?)
Voiced by: Rie Kugimiya
A male Hastur who was the space elementary school classmate of Nyaruko and Kūko. He is the son of the owner of a famous video game company in space. He was first sent to get intel of earth's entertainment from Yoriko, but he failed and decided to stay on earth. He has feelings for Mahiro, and enrolled Mahiro's school under the name Hasutā Yasaka. He possess the power of air, and is known to be stronger than both Nyaruko and Kūko, since he is the one who always stop their fight during space elementary school.

Shantak-kun (シャンタッ君 Shantakkun?)
Voiced by: Tomoko Kaneda (Drama CD), Satomi Arai (2nd season anime)
Nyaruko's pet. A female shantak (monster in Cthulhu mythos, a bird with horse's head and bat's wing). have many different forms including enlarging to stories high, a dog's size. or turn into different vehicles. According to Nyaruko, shantaks' eggs are precious and expensive food in space, despite Mahiro always refuse to eat them.

Atko (アト子 Atoko?)
Voiced by: Azusa Kataoka
Only appear in light-novel and 1st season anime. Her character design resembles Hatsune Hirasaka from the visual novel Atlach-Nacha; wears an outfit with a spider motif. Her propriety belies her perversity. She has grudge against Yoriko.

Antagonists

Nodens (ノーデンス Nōdensu?)
Voiced by: Bin Shimada
A space smuggler. he attemped to kidnap Mahiro, planning to use him to star in a Yaoi film. He sends Nightgaunt to attack Mahiru while hiring Kūko as a bodyguard. After he was defeated and reveals his true plan, Mahiro orders Nyaruko to "destroy" him.

Nyaruo (ニャル夫?)
Voiced by: Takeshi Kusao
Nyaruko's older brother. He has great hatred and jealousy toward Nyaruko since she gratuates from one of the best colleges in space as the best of her year, while he dropped out of a third-class college. To seek revenge, he arrived on Earth and killed the gods in Dreamlands. He is defeated by Nyaruko with Shantak-kun in her motorcycle form, in the novel he was ran over multiple times in Dreamlands, and is sent to space jail later; while in anime he is bumped on the leg and sent flying. Nyaruko looks down on him as she calls him a "wild Nyarlathotep" rather than her brother in the story.

Description
Requested by

From wiki:

Haiyore! Nyaruko-san (這いよれ! ニャル子さん?) (The Crawling Nyarlko) is a Japanese light novel series written by Manta Aisora with illustrations by Koin, inspired by H. P. Lovecraft's Cthulhu mythos.

Seven volumes have been published by Soft Bank Creative under their GA Bunko imprint. A flash original video animation (OVA) by DLE titled Haiyoru! Nyaruani was published in between October 2009 and March 2010.

A Flash Anime television series by DLE, Haiyoru! Nyaruani: Remember My Mr. Lovecraft, aired in Japan between December 2010 and February 2011.

A television anime series by Xebec began airing in April 2012.
Two manga adaptations have been produced.

Plot

The story of Haiyore! Nyaruko-san centers around Nyaruko, a formless Cthulhu deity of chaos (Nyarlathotep) who can take on the shape of a seemingly ordinary silver-haired girl. Mahiro Yasaka is a normal high school boy who is chased by aliens one night, until Nyaruko saves him.

Characters
Human characters

Mahiro Yasaka (八坂真尋 Yasaka Mahiro?)
Voiced by: Eri Kitamura
A human boy who reluctantly finds himself under the protection of Nyaruko. He tends to attack aliens by stabbing or throwing forks whenever they make him angry. He appears to attack so fast that currently no alien has able to dodge yet. At first he dislikes aliens and wants to kick them out, but as the the story progresses he starts to become more tolerant toward their actions. He is attracted to Nyaruko (her human form being specifically tailored to his tastes), but dismisses her advances as he believes nothing good would come of such a relationship.

Yoriko Yasaka (八坂頼子 Yasaka Yoriko?)
Voiced by: Kikuko Inoue (Drama CD), Aya Hisakawa (2nd season anime)
Yasaka Mahiro's mother, a real monster hunter who started her career during college. She has a young appearance that makes it hard to believe that she has a son in high school. She conceals her true job from her son until returning home during the plot. She is kind to friendly aliens, accepting Nyaruko, Kūko, and Hasuta living in the house, and their actions to pursue Mahiro. However, she advises Nyaruko to take her relationship with Mahiro a bit slower. She uses a throwing fork as her weapon in hunting monsters, and appears to be better skilled and can carry more forks than her son. She is obsessed with video games, buying different game machines whenever she returns home from hunting. She also has a habit of hugging Mahiro, claiming she's replenishing her "sononium."

Alien characters

Nyarlathotep (ニャルラトホテプ Nyaruratohotepu?) / Nyaruko (ニャル子?)
Voiced by: Kana Asumi
A Nyarlathotepan (alien from Nyarlathotep) who is sent by Space Defence Agency to Earth to protect Mahiro Yasaka and ends up falling in love with him. She takes a human form of silver long-haired girl. She is always friendly to Mahiro, eager to pursue him; but often shows abusive and brutal habits to any hostile aliens. She is also obsessed with otaku culture. She takes the name Nyaruko Yasaka as Mahiro's cousin when staying at Mahiro's house and going to school. Her age is unknown since she and Kūko will stop Mahiro whenever he becomes curious or doubting with her age, although she states that she has already graduated from space college. She is also known to be smart and self-confident, as she graduated from one of the best universities in space at the top of her class, and entering the Space Defence Agency by exam. As a top agent, she mainly uses space CQC to fight (note that the definition of "space CQC" is defined by the user and is not restricted to close quarter combat weapons).

Cthugha (クトゥグア Kutugua?) / Kūko (クー子?)
Voiced by: Miyu Matsuki
A female Cthughan (alien from Cthugha). She takes a form of slender, red-haired girl. She is in love with Nyaruko despite her race is the archnemesis of nyarlathotepians. She transfers to Mahiro's school and takes the name Kūko Yasaka, Nyaruko's "wife". At first she is hostile toward Mahiro, but as the story progress, she become more friendly, and changed her goal to consist a family with both Mahiro and Nyaruko. She is also obsessed with otaku culture. Kūko was Nyaruko and Hasuta's space elementary school classmate ans appears to at the same age of them, although she became a NEET after graduating from high school, and become a Space Defence Agency agent later by using the relationship of her uncle who is an employee in Space Defence Agency. She concealed her feeling of Nyaruko to her family, since love between Nyarlathotep and Cthugha are referred to as shame of the family among Cthughans. She possess the power of fire, able to control fireballs, heat, or drones that firing laser, she refer them as space CQC - Cthugha version.

Hastur (ハスター Hasutā?) / Hasuta (ハス太?)
Voiced by: Rie Kugimiya
A male Hastur who was the space elementary school classmate of Nyaruko and Kūko. He is the son of the owner of a famous video game company in space. He was first sent to get intel of earth's entertainment from Yoriko, but he failed and decided to stay on earth. He has feelings for Mahiro, and enrolled Mahiro's school under the name Hasutā Yasaka. He possess the power of air, and is known to be stronger than both Nyaruko and Kūko, since he is the one who always stop their fight during space elementary school.

Shantak-kun (シャンタッ君 Shantakkun?)
Voiced by: Tomoko Kaneda (Drama CD), Satomi Arai (2nd season anime)
Nyaruko's pet. A female shantak (monster in Cthulhu mythos, a bird with horse's head and bat's wing). have many different forms including enlarging to stories high, a dog's size. or turn into different vehicles. According to Nyaruko, shantaks' eggs are precious and expensive food in space, despite Mahiro always refuse to eat them.

Atko (アト子 Atoko?)
Voiced by: Azusa Kataoka
Only appear in light-novel and 1st season anime. Her character design resembles Hatsune Hirasaka from the visual novel Atlach-Nacha; wears an outfit with a spider motif. Her propriety belies her perversity. She has grudge against Yoriko.

Antagonists

Nodens (ノーデンス Nōdensu?)
Voiced by: Bin Shimada
A space smuggler. he attemped to kidnap Mahiro, planning to use him to star in a Yaoi film. He sends Nightgaunt to attack Mahiru while hiring Kūko as a bodyguard. After he was defeated and reveals his true plan, Mahiro orders Nyaruko to "destroy" him.

Nyaruo (ニャル夫?)
Voiced by: Takeshi Kusao
Nyaruko's older brother. He has great hatred and jealousy toward Nyaruko since she gratuates from one of the best colleges in space as the best of her year, while he dropped out of a third-class college. To seek revenge, he arrived on Earth and killed the gods in Dreamlands. He is defeated by Nyaruko with Shantak-kun in her motorcycle form, in the novel he was ran over multiple times in Dreamlands, and is sent to space jail later; while in anime he is bumped on the leg and sent flying. Nyaruko looks down on him as she calls him a "wild Nyarlathotep" rather than her brother in the story.