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Must not Search

Words that have been recommended to not be search. Also a Japanese wiki rating such things on a danger level of 1 to 7. It is very popular within Japanese internet culture.

This article contains shocking and offensive content. Read at your own discretion.

Note that these can vary to tame to extreme depending on the person.

Outline

The contents of this includes sites, images, videos, ect. of erotic (sexual), gory (R-18G), ghost stories, phobics, surprises, etc.

However, some of them may cause damage to your PC, such as browser crashes caused by PC viruses or web scripts. Therefore, unless you have sufficient immunity, tolerance, and knowledge of personal information leakage and security, you should not search for them out of curiosity (you may need to search for them for academic or research purposes, but even in that case, you need immunity).

If an image, video, or exe (a PC executable file) is hit, the viewer will suffer some kind of damage. Genres include PC damage, grotesque, horror, occult, denpa, insanity, depression, ect. In 2014, TBS aired a one-off TV program which examined search terms and urban legends.

Aside

In recent years, videos of people searching for words they shouldn't search for have become popular on video sharing sites. There are many different types of live search videos, so if you're curious about search terms, you can watch along.

Currently, the highest danger level is 7, but at one time there were even danger levels up to 8. The description was "may be life threatening" in bold red letters with a black background. Wiki archives from that time do exist.

Currently, the number of words registered in the Wiki is over 2100.

List

In this article, only items for which pixiv articles exist or going to (even if they are not included in the Must not Search wiki) are listed.

The contributors, administrators, and authors of this article are not responsible for any unpleasant feelings you may experience as a result of searching.

About Genres

Hall of FameParticularly well known in the Japanese language.
PC DamageItems that cause damage to computers.
GrotesqueViolence and cruel descriptions and expressions, etc.
InsanityAn act that goes against common sense.
SexualItems that fall under the category of adult content.
SurpriseScary images, malicious prank videos, etc.
Occult/SuspenseMystical or supernatural phenomena. Suspense being there as a sense of danger.
DenpaLiterally means "electromagnetic wave". Something that is totally out of touch with the sensibilities of ordinary people.
RealityAn incident or event that actually happened.
Disease/DeformityUnusual appearance.
Unusual OrganismCreatures or other beings with unusual characteristics or abilities (fictional creatures are also included here).
Joke/NetaBasically, anything that can be laughed off. Neta being a Japanese slang of this.
MysterySomething whose intent or identity is unclear, mysterious, or whose meaning is not well understood.
Psyche/FlashingContent with heavy flashing, loud colors and music.
PhobicsFor extreme or irrational fear of or aversion to something.
HorrorDescriptions that stir up fear.
DepressionTragic content.
FilthThe wiki classifies this as excrement or discharge from the body.
OrderGenreDescriptionDanger Level
#
8teacups.exePsyche/Flashing, Denpa, Surprise, Mystery, PC damageA chaotic, flashing and unintelligible video that is loud at the start.4
A
Ai to Yuuki to KashiwamochiDepression, HorrorPuzzle game in the style of Yoshi's Cookie.2
AmblypygiUnusual Organism, PhobicSpider, some have been sold as pets.2
B
Backwards Girl: Endless Summer HolidaysSexual, Depression, GrotesqueA novel in which a girl is kidnapped, confined, and tortured continuously.4
Brazen BullRealityCruel method of execution said to have originated in ancient Greece.2
C
CandiruUnusual OrganismCatfish from the Amazon. Frankly, more dangerous than a piranha.1
Cat SoupDenpa, GrotesqueCruel but award-winning anime. This can also mean the manga it was based off of (see Nekojiru).1
Chargeman Ken!Insanity, Joke/NetaA crazy anime that has a lot of things going for it.1
CreepypastaGrotesque, Horror, Occult/Suspense, SurpriseWestern internet urban legends.3
D
Darwin AwardsJoke/Neta, Insanity, RealityA tongue-in-cheek honor for people who died in a "idiotic (unsusal) manner".1
Delete ImmediatelyHorror, Occult/SuspenseFake special screen of Japanese text covering the screen with the aforementioned title in Shin Megami Tensei II.2
Demodex FolliculorumReality, Unusual Organism, PhobicMicroscopic mite that can only survive on the skin of humans.2
Depleted Uranium AmmunitionDisease/Deformity, Reality, Hall of FameImages of deformed children born due to radiation hit.3
Doki Doki Literature Club!Depression, Surprise, Horror, Grotesque, FilthWhat seems like a dating simulator is really a fourth wall breaking psychological horror game.3
Don't Look for WallySurprise, HorrorA screamer flash game of Where's Wally (Waldo in North America).3
Doraemon the HorrorHorror, GrotesqueHorror parody of Doraemon by Hideshi Hino.2
E
Ed GeinGrotesque, Reality, Insanity, HorrorA murderer who was crafted with dead bodies.4
Eien to Natta Rusuban ~Papa wa Kaeranai~Depression18+ game where a girl is subjected to severe humiliation and torture. Used copies are sold for a high price.2
Eight Feet TallHorrorJapanese urban legend of a tall woman named Hachishaku-sama who abducts children.1
EihortHorror, PhobicA monster by H. P. Lovecraft2
Elfen LiedGrotesque, DepressionAnime and manga with full of beheadings and dismemberment.3
ElsagateSexual, Reality, FilthSocial issue on Youtube and Youtube Kids.
Eudocima TyrannusUnusual Organism, Phobic, HorrorWhile not as scary, it's their larvae that is seen as creepy.1
F
Fadi Ammar ZidanGrotesqueSyrian soldier that was killed by tank on video.5
Faithful Reproduction of a Dream I had TodayJoke/Neta, HorrorMysterious text to speech version of Ievan Polkka with visuals of the 1927 Metropolis Maria's dance scene sped up.1
Female SageHorrorCharacter from Dragon Quest 3 but looking up the word in Japanese also shows up a scary face of a woman.3
G
GiygasHorror, Psyche/FlashingAntagonist of the MOTHER (Earthbound) series. In MOTHER 2 there's a theory that they have a outline of a baby.2
Gloomy SundayDepression, Occult/SuspenseA song said to make people commit suicide when listened.2
H
Hakkda Mountains IncidentGrotesque, Depression, RealityLarge-scale distress incident that occurred in Japan in January 1902.3
Happy Tree FriendsGrotesqueVery violent web cartoon by Mondo Media.3
Hong Kong 97Grotesque, Insanity, Hall of FameInfamous unlicensed game by Kowloon Kurosawa. Contains a image of a dead person.3
Hydnellum PeckiiUnusual Organism, PhobicA mushroom that looks like it's bleeding all over.2
I
J
John Wayne GacyOccult/Suspense, Reality, InsanitySerial killer who enjoyed dressing up as a clown.2
K
KiviakGrotesque, RealityTraditional wintertime Inuit food from Greenland.3
KunekuneOccult/Suspense, Hall of FameJapanese internet urban legend called Wriggling Body in English.2
Kure Kure TakoraInsanity, Joke/NetaTokusatsu kids' show with episode 220 never being rebroadcast. The contents was seen as verbally abusive towards the mentally ill with the character getting the abuse going on a violent rampage.1
Kuso Miso TechniqueSexual, Joke/Neta, Hall of FameGay manga that is very popular within Japanese internet culture.1
KusozuGrotesque9 stages of a woman's decay. Often depicts women such as a Empress to show "No matter how beautiful a woman is they will end up being ugly in the end.".2
L
LampreyUnusual OrganismJawless eel with a with grotesque mouth.2
Lee HardcastleGrotesque, HorrorClay animator on Youtube. Made a unofficial sequel Takena's Chainsaw Maid3
LeucochloridiumUnusual Organism, PhobicParasites that use snails as hosts.3
Linda³GrotesqueOne of the few games given a 18+ rating on PC Engine2
Little Baby's Ice CreamHorror, DenpaIce cream company known for the 2012 commercial, "This is a Special Time"1
Louis XVIIDepression, Insanity, RealityA king of France who lived a tragic life.2
LobotomyRealityWorld's most dangerous surgery.1
LSD: Dream EmulatorPsyche/Flashing, DenpaFrom the artist Osamu Sato, it's a bizarre psychedelic game that does not call itself a game.2
M
Marimo-chan Bye ByeGrotesque, DepressionImage of Jinguuji Marimo in Muv-Luv Alternative with a exposed crushed head.4
Matsuyama Doctor HarassmentHorror, Sexual, Grotesque, Phobic, Psyche/Flashing, Denpa, Insane, Hall of FameA harassment movement on Matsuyama Kyowa Hospita of shock sites disguised as review sites about the affiliated doctors.6
Me!Me!Me!Grotesque, SexualErotic, gory music video for Japan Animator Expo.3
Mike the Headless ChickenGrotesque, Reality, Hall of FameA chicken who lived for 18 months after his head was cut off.
Momoiro UsagiHorror, Denpa, SurpriseAn original song by Healing-P for Kagamine Len.2
Mortal KombatGrotesqueA brutal fighting game known for it's gory fatality animations. In a more scarier note this had effected the mental toll of the animators due to the references they used.4
MopemopeHorror, Hall of Fame, Phobic, SurpriseControversial music video almost falling into Elsagate territory by being heartwarming at first glance.2
N
NarutaruGrotesque, Sexual, DepressionKnown as Shadow Star internationally. This work is characterized by many extreme scenes.3
Natsumi Step!Horror, Occult/Suspense, Hall of FameHorror web anime made in flash. Takehara Minoru most popular work, even been seen by quite a few people in the west.1
NeedlefishUnusual Organism, GrotesqueA fish that can jump out of the sea and kill people.3
NishikigaoHorror, Jokes/Neta, PhobicGame glitch where a character's face becomes distorted.1
NugumuHorror, Surprise, Mystery, Hall of FameA self-proclaimed Virtual Youtuber.2
O
Ogiwara CrazyHorror, SurpriseThe ending of Crazy Pierrot is screamer image said to be the game creator Yoshiaki Ogiwara.3
P
panapp FaceHorror, Joke/NetaAn ice cream that, depending on how you eat it, can create a creepy face.1
PennywiseHorror, Joke/NetaClown character from the movie IT1
Phantom BrainDenpa, Horror, Surprise, Psyche/Flashing Full title "Phantom Brain 樹海の神になって" is a chaotic video that can't be fit within a short description2
Pingu 24th EpisodeHorror, Denpa, Joke/NetaAn episode seen so horrific that it has been banned in some countries.1
PiropitoHorror, Phobic, Hall of FameAlso known as nana825763 on Youtube, is a visual artist known for Username666.3
Pipa PipaUnusual Organism, PhobicA frog that can trigger people with trypophobia.3
Pizza Time RemasteredGrotesque, Sexual, Joke/Neta, InsanityFull title "Pizza Time Remastered new on Nickelodeon" is a video featuring TMNT characters doing obscene acts.2
Popee the PerformerGrotesque, Joke/NetaCG' kids anime known for it's over the top violence.2
Pony IslandHorror, DenpaWhat starts as a cute game becomes unsettling2
Q
R
Running CirnoPsyche/Flashing, Hall of Fame, Horror, Jokes/Neta, DenpaA video made in MMD of a creepy running animation of Cirno.2
R
RoadkillGrotesque, RealityAnimals killed by car.3
Rosalia LombardoReality, DepressionKnown as the most beautiful mummy in the world.1
S
Sada AbeGrotesque, Reality, InsanityJapanese geisha and prostitute who murdered her lover during the Showa Era.2
Saikin OsenHorror, PhobicAnother Vocaloid song with many dark theories.2
Sampoong Department StoreInsanity, RealityDeadliest modern building collapse until the collapse of the World Trade Center.2
Satoru-kunOccult/SuspenseJapanese urban legend of getting any answer from a public phone.1
Saturn Devouring His SonGrotesque, Joke/NetaThere is actually two paintings of this, the more popular one is by Francisco Goya.3
Sayonara wo Oshiete ~Comment te Dire Adieu~Grotesque, Sexual, DepressionVisual novel by CRAFTWORK. A fan English translation was made on August 2021.2
Sawney BeanGrotesque, Insanity, RealitySaid to be the head of a cannibal clan.1
SCPGrotesque, Horror, DepressionA site that collects fictional monsters.1
Sennichi Department StoreReality, Occult/SuspenseJapanese department store that went in flames.2
Shojo TsubakiGrotesque, SexualMore specifically the manga adaptation Mr. Arashi's Amazing Freak Show and it's anime known as Midori in the west.3
Shuji TsugawaOccult/Suspense, Joke/Neta, Horror, Hall of FameA character from one Detective Conan's more depressive episode.1
SpooJoke/Neta, Hall of Fame, HorrorMore specifically Shoko Haida's drawing of the character that became incidentally scary.1
T
Terrifying Kyou-chanGrotesque, Joke/Neta, InsanityParody of Hitoshi Matsumoto's Obake no Q-taro.3
The Dawn Is Your EnemyHorrorAn Adult Swim bumper to scare away kids1
This ManOccult/Suspense, Joke/Neta, HorrorA marketing stunt featuring a somewhat unnerving picture of a man's face.1
Tiananmen SquareGrotesque, RealityMore on the massacre that took place in Tiananmen Square, Beijing.3
Toro on Holiday PhotoHorrorA rumored photo of ghost in the game Toro on Holiday.1
TtongsulRealityKorean alcohol made from human feces. Lacking in info.2
U
V
W
Waita UzigaGrotesque, SexualBizarre manga artist with his most known work in the west being Mai-chan's Daily Life.3
X
X MultiplyHorror, GrotesqueA game that takes place inside a woman's body.2
Y
Yoshie KimuraHorror, Joke/NetaMain antagonist of Death Forest.
You Are An IdiotPC DamageA flash virus that would open many windows.4
Yume NikkiPsyche/FlashingGame where you walk around in a dark dream.1
Z

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