Manatsu no Yo no Inmu(A Midsummer Night's Dirty Dream) (真夏(まなつ)の夜(よ)の淫夢(いんむ)),¹⁾ also known as INMU (淫夢) or INM, originally referred to the 2001 Japanese amateur gay porn tape, Babylon 34 from Coat Corporation, which would ignite a scandal over a certain top college baseball draft prospect's alleged involvement.

Nowadays, it's a catch-all term for a subculture that jokes about Japanese gay porn since its resurgence in the 2010s, after it dominated Niconico's former Rei no Are category and succeeded Gachimuchi. On the other hand, it toes the line of homophobia and queer exploration.²⁾

“I was young, playing baseball, and going to college, and my teammates and I needed money.”
– Kazuhito Tadano³⁾

Back in July 20, 2001, Coat Corporation would publish Babylon 34 and, somehow, people suspected that one of the amateur actors was college baseball pitcher Kazuhito Tadano.⁴⁾ This scandal would tank his draft value, causing Tadano to go undrafted in the 2002 NPB Draft, so he ended up on the Cleveland Indians farm system in 2004 and eventually had a chance to say that he ultimately regrets the incident.⁵⁾⁶⁾

After this, Tadano returned to Japan and joined the Hokkaido Nippon-Ham Fighters in 2007, showing up in the 2012 Japan Series where he was thrown out a game for a 'dangerous' pitch,⁷⁾ then retired in 2014.⁸⁾ Since then, Tadano has worked as a pitching coach and a scout,⁹⁾ but recently stepped away from baseball on December 28, 2023.¹⁰⁾¹¹⁾ He currently runs a baseball blog.

On the internet, Inmu was lumped in with the 'homoneta' (e.g. Kuso Miso Technique, Hentai Kuso Oyaji), but wasn't very notable as there wasn't much to work with, thus why Gachimuchi had took priority in the 2000s. However, this changed when the Rei no Are category was set up in January 2010 and people found out about Babylon 27's 'Karate Club' episode in July 2010, which sparked this massive Inmu renaissance.

This discovery was huge as the 'Karate Club' episode served as a much better entry point for Inmu, with their new centerpiece being 'Yajuu Senpai' from Babylon 34's 'Coma Rape' episode, and people seriously began looking at the massive cache of domestic gay porn, providing them an endless stream of new material to work with. Over a decade has passed since then.

Babylon 34: A Midnight Summer's Lewd Dream ~the IMP~ (BABYLON 34 真夏の夜の淫夢 ～the IMP～) is the Japanese amateur gay porn tape, produced by Coat Corporation and released on July 20, 2001. It contains four episodes, with a combined runtime of 90 minutes.¹²⁾ For obvious reasons, the tape would be discontinued by November 22, 2003, and the first episode is notably cut out of reprints and compilations.

1. Yakuza Threat! The Athletic Club's Counterattack (極道脅迫！体育部員たちの逆襲) @ 1:30
   Three young athletes rear-end a Yakuza member's car, so the Yakuza member confiscates the driver's license and subjects one of them to sadistic gay sex. They later turn the tables on him.
2. Model's Counterattack! Rapist Recruiter (モデル反撃！犯されるスカウトマン) @ 38:35
   A part-time employee is picked up by a recruiter for a photo shoot for ¥50,000, except this photographer isn't satisfied, which is when the recruiter reveals that he expected the part-timer to suck dick.
3. Voyeurism! And Sadomasochistic Delusions... (盗撮！そしてSM妄想へ･･･) @ 54:04
   This follows two college roommates and one's been filming the other without permission. They both get drunk and the person filming gets a sadomasochistic dream while watching the footage.
4. Coma Rape! The Senior Who Became A Beast (昏睡レイプ！野獣と化した先輩) @ 68:02
   After swim club, the senior brings a junior home, drugs his ice tea, and rapes him after he had put him in a coma. The junior ends up waking up and they both start revealing their love for each other.

Yajuu(Beastly) Senpai(Senior) (野獣先輩), also known as TDKR(Tadokoro)¹³⁾ or YJSNPI, is an amateur porn actor that once worked for Coat Corporation from 1999 to 2002 and had became the 'centerpiece' of the Inmu phenomenon due to his appearance in Babylon Stage 27's 'Karate Club' episode. There isn't a lot of details on him,¹⁴⁾ since identifying amateur porn actors is discouraged,¹⁵⁾ but he was likely born in the 1970s.

• Babylon Stage 27 / The Karate Club's Sex Technique (空手部・性の裏技)
  The club showers, relaxes in a washitsu, then the two seniors would proceed to call out the junior since he was glancing at them, so they strip the junior and have a three-man orgy.
• Scooop!!! 01: Virtual Sex - Meet the Cum Corps!!! (Scooop!!! 第1弾 VIRTUAL SEX イカせ隊見参!!!)
  With an iconic initialization (e.g. EMURATED, VIRTUAL SEX) where Darude's Sandstorm plays, he wears a Cyclops outfit full-body VR suit and moans while experiencing the virtual orgy.
• Perverted Interviewer SUPER S17 (変態面接官SUPER S17)
  One of the masked 'Batman' interviews. He gives vague details about himself in his underwear, then strips nude, then the masked interviewer proceeds to rub his genitals, kissing him, etc.
• The Fetish Vol. 3 / Please! Don't Look! My Precious Thing (お願い！見ないで！ ボクのおとしもの)
  The other masked 'Batman' interview, but with that famous casting couch scene. After this, we see the interviewer administers an enema and asks him to defecate for the camera.
• Discovery No. 6: Real Shock!! Youth Typhoon (DISCOVERY 第六号リアルショック!!青年TYPHOON)
  His last known role. For some reason, a scene is cut out from the Discovery No. 10 compilation, but you're not missing much since the video doesn't have a lot of memorable lines or anything.

Monzetsu(Mental Agony) Shōnen(Young Boy) 5 (悶絶少年 其の伍) is the professional Japanese gay porn DVD, produced by Acceed and released on April 8, 2010. It contains four episodes, with a combined runtime of four hours. Unlike the aforementioned works, the usage of professional porn actors allows for more 'hardcore' fetishes to be present, which arguably presents a return to form since the video is partially shock content.

1. Bondage Training (緊縛調教)
   A naive country boy gets roped into bondage. He gets hung and whipped, gets a suspended enema, experiences hot wax torture, etc. Through all the pain, he keeps a 'shameful' erection.
2. 'Shōnen' Kidnapped and Raped (少年拉致強姦)
   A businessman kidnaps a 'young boy' wearing a track suit going home from school. The boy trembles as he hits him with a bamboo sword, but the businessman doesn't hold back with his abuse.
3. SM Club (SM倶楽部)
   A masochistic boy comes to receive training for the first time. He's asked to lick someone's shoes, gets whipped, gets his hair cut, hot wax torture, then faints from the hardcore training.
4. Perverted 'Shōnen' Slave Dog Training (変態少年奴隷犬育成)
   A masochistic boy asks to become a good slave dog. The master orders him to eat vegetables from his anus, drink piss, stick a golf ball up his ass, then makes him eat shit.

Coat Corporation is a Japanese amateur gay porn video production company that was founded in 1993, who became known for series like Babylon, Power Grip, Out Staff, Perverted Interviewer, The Fetish, and so on. The company's headquarters are in Shimokitazawa with the building having a reputation of being the famed 'Yajuu House' (野獣邸, Yajū-tei).¹⁶⁾ This has led to several incidents.

• Episode 1
  • TDN (Tadano) - Baseball pitcher. He plays the senior, Miura, who gets told to act like a dog.
  • DB (Daibō) - He plays the junior, Nakata, who pulls the 'turning offense' (一転攻勢, itten kousei).
  • HTN (Hatano) - He plays the other junior. His character doesn't play a huge part.
  • TNOK (Tanioka) - He plays the antagonist, the Yakuza member, who gets a bullet to the ass.
• Episode 2
  • NSOK (Nishioka) - He plays the part-timer. Mostly speaks in a monotone voice.
  • DRVS (Darvish) / 'Black' (黒いの) - He plays the recruiter, Kobayashi.
  • SBR (Saburō) / 'White' (白いの) - He plays the photographer on the receiving end.
• Episode 3
  • GO - He plays a college student. He is better known as the charismatic scouter in Episode 1 of Babylon Stage 28, tricking a gas station employee and changing his tone, thus “GO is GOD”.¹⁷⁾
  • Majime-kun (マジメ君) - He plays the college student, Kono, who got videotaped.
• Episode 4
  • Yajuu Senpai (野獣先輩) - He plays the senior, Tadokoro, who drugged the ice tea. He's also known for his other works, which was already detained in a previous section.
  • Tōno (遠野) - He plays the junior, Tōno. His high-pitched moan would be dubbed 'Tono's World' (世界のトオノ) because it sounds like the 1986 song, "I Can't Wait" by Nu Shooz.¹⁸⁾
• Miscellaneous
  • Inmu-kun (淫夢くん) - The mysterious animal during the intro sequence. “Woo…” (ｳﾞｫｰ…). It was believed to be a slow loris, before it was properly identified as a squirrel monkey.¹⁹⁾
  • Mr. Houseplant (観葉植物くん, Kanyōshokubutsu-kun) - The bamboo palm in TNOK's office.
  • Cicada (セミ兄貴, Semi-aniki) - The cicada sounds.

• MUR (Miura) - He plays the bald senior, Miura, who says the “sōdayo” (そうだよ, lit. “that's right”) line which piggybacks on Yajuu Senpai noticing that KMR was staring at them in the showers.
• KMR (Kimura) - He plays the junior, Kimura. In the lore, he has become the serious tsukkomi.

• Pinky (ピンキー) - She's a woman that appears in a number of their videos, supposedly named after Pinky & Killers, and her face is often paired with a 'dededon!' (デデドン！) sound of despair.
• SKGC (Sakaguchi) - He plays the police officer from Babylon Stage 17. “Keisatsu da!” (警察だ).
• SIY (Seiya) - He plays a gas station clerk that GO recruits in Babylon Stage 28.
• KBS Trio (KBSトリオ) - The trio in Babylon Stage 30. “Kane! Boryoku! SEX!” (金！暴力！SEX！).²⁰⁾
• HND△ (Honda-san kakke) - He plays the debt collector in Babylon Stage 30.
• SNJ (Shinjo) / FFSNJ - He gets 'fistfucked' (FF) in Scooop!!! 5.
• Generic Passerby Geezer (一般通過爺, Ippan Tsūka Jiji) - He is the random cyclist, wearing a dark red shirt, that literally crosses in front of the camera in Chapter 3 of Babylon Stage 42.
• AKNM (Akanuma) - He plays the rugby football player in Japan Round 6 and Japan Round 9.
• Miyanaki Michio (宮永通世) - He plays the monk in Power Grip 104 and dings the bell that would become associated with the '33–4' score.
• NKTIDKSG (Nekutai Dekasugi) - He plays the man with a 'huge fucking necktie', thus the name, in Perverted Interviewer SUPER S 20th.

Acceed is a subdivision of “HINA Co., Ltd.” (有限会社HINA, Yūgengaisha HINA) that was founded in 2006. It focuses on Japanese professional gay porn video production, and it tends to feature more 'hardcore' fetish content since they use professional actors. Unlike the Coat Corporation characters, the Acceed characters can be linked to a gay porn star who is aware of this 'fame'.

• Hide (ひで) - He plays the kidnapped 'young boy' in Episode 2 of Monzetsu Shonen 5.
  • Hide's OC (ひでのオリキャラ) - A weird, lumpy frog on his pencil case.
• Acceed's Three Musketeers (Acceed三銃士, Acceed Sanjūshi)
  1. Gyakutai Ojisan (虐待おじさん, lit. “Abusive Old Man”) - He plays the bamboo sword-wielding businessman in Episode 2 of Monzetsu Shonen 5. He is also in The Claimer 1.
     • Mr. Flowerpot (植木鉢くん, Uekibacki-kun) - The 'expensive' flowerpot that gets smashed by a volleyball in The Claimer 1.
  2. KBTIT (Kubo Taito) / Takuya-san (タクヤさん) - He plays the trainer, wearing a fishnet shirt and sunglasses, in Episode 3 of Monzetsu Shonen 5. “Arigato nasu!” (ありがとナス！).
  3. Hirano Gengoro (平野源五郎) - He plays the manager in Episode 3 of Monzetsu Shonen 5. The actor behind the character has a Twitter account at @acceed_hirano and embraced Inmu.
• Yuusaku (ゆうさく) - He plays Daisuke in Prisoner Daisuke. For some reason, he's depicted as a hornet that stings himself, then Nash Music Library's SC-6804 (NSC-SC-6804) plays.

• Dragon Tanaka (ドラゴン田中) - He plays the man with 'huge hole' in Kurutta Yajuu-tachi. He allegedly had a reputation in Osaka. Notable “WORLD WAR!” moan. sm16987705.
• Field Supervisor (現場監督, Genba Kantoku) - He plays a fat masochist in Kyokon Nikudansen. His “futoi chinpo ga omanko ni haitchau” (ふといちんぽがおまんこにはいっちゃう) became “F.C.O.H.” (FCOH).
• Section Chief (課長, Kachō) - He plays the section chief in Kachō Kowareru, where he uttered moans, cat-like moans, and repeats “omanko” (おまんこ) throughout the video.
• Oversized 'Hole' Daddy (ガバ穴ダディー, Gaba Ana Dadī) - He plays a fat teacher in Gaba Ana Daddy and gets his belly rubbed. He is apparently known for his weird-sounding moans.

• In the Inmu community, the term 'harmful rumor' (風評被害, fūhyō higai)²¹⁾ describes cases where the community 'discovers' something and dragged it into their subculture, despite having no connection, due to users often 'forcing' Inmu by pointing out similar expressions, sounds, monotone reading, etc.
• You can visit, or take a 'pilgrimage' to, some of the real-world locations that are associated with Inmu.
  • Azuma Sushi (あずま寿し) @ 35.6654°N, 139.6706°E (facing west)
    The rear-ending from Episode 1 of Babylon Stage 34. The store has since closed and, since 2015, it has since become an izakaya called “Nakachan-tei” (中ちゃん亭), then became “Sei” (青).
  • “Yajuu House” (野獣邸, Yajū-tei) @ 35.6657°N, 139.6696°E (facing east)²²⁾
    The north entrance of Coat Corporation's headquarters, where the “こ↑こ↓” scene was shot.²³⁾ It has gathered a lot of attention for the August 10th pilgrimages, which are discouraged.²⁴⁾
• In the massive Chinese community, its name is rendered as Zhòngxià Yè Zhī Yínmèng (仲夏夜之淫梦), with 'yínmèng' (淫梦) being replaced with 'yínmèng' (银梦) to evade the adult content wordfilters.
  • The 'iiyo koiyo' line is often rendered as '114514', but the Chinese community has invented a unique made-up idiom of 'yìyīshí, wùyīshì' (逸一时，误一世), which roughly means “a moment of leisure can lead to a lifetime of mistakes”.
• The (首) emoticon, noted for its resemblance to Yajuu Senpai, borrows the kanji for “neck” (首, kubi).

• Rei no Are - The former category on Niconico.
  • Cookie☆ - A certain Touhou Project fan collaboration that historically served as bait-and-switch.
  • Gachimuchi - Inmu is often paired with Gachimuchi and Hentai Kuso Oyaji.
• TDN Notation - Term for the Japanese version of disemvoweling, originally to censor Tadano's name.
• Unprecedented Boom - Term for anything in Rei no Are that suddenly gains massive popularity.

• Manatsu no Yo no Inmu Wiki - Naturally, there's gay porn here, so watch out.
  • Babylon Stage 34 on the Inmu Wiki
  • Yajuu Senpai on the Inmu Wiki
  • Harmful Rumor Damage on the Inmu Wiki - It's a long list.
• Manatsu no Yo no Inmu on the Cookie☆ Explanation Wiki
• Manatsu no Yo no Inmu on Namu Wiki [KO]

　　　　　　　　　　　　　　,,....,,,,,,,:;;;;;;;;;;;;;::::,,,.._
　　　　　　　　　　　,,..;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;:::;;;;;;;;ヾ､
　　　　 　 　 　 　 ,.:;;;;;;;;;;;;;;;;;;;;;;::;;;;;;;;;;;;;;;;;;;;;;;;;;;;;:ミ,
　　 　 　 　 　 　 ,;;;;;;:;;;;;;;;;;;;;;:´ﾉﾚﾞ´ﾞ"ﾞノﾉ"ﾞヾ;;;;;;;;ﾐ
　　　　　　　　　 ;;;;;;;;;;;;;;;;;;;;'　　　　　´ ´　　　ヾ;;;;ﾐ
　　　　　　　 　　;;;;;;;;;;;;;;;;;;;;>　　　　　　 　 　 　 ﾞｌ;ﾐ
　　　　　 　 　 　 ;;;;;;;;;;;;;;:'　 　,,.;;;::;;;､,　　　　,,.:;;;,.!;;'
　　　　　　　　　 ;'ﾞﾞﾞヽ;;;;' 　　 _,.ﾆ=,..､　　　 ,.=ﾆ､.!:;
　　　 　 　 　 　 { r'ﾞt i:;　　　｀'ﾞﾞ'-‐'ﾞ　.: 　;' ﾞ'ｰ'ﾞ .';'
.　　　 　 　 　 　 ';ゝ,､y;　　　　　　　 ,.;　　ヽ　　　}
　　　　　　　　　　ヽ､_λ　　　　　　 (__,､__,､)　 　;'
　　　　 　 　 　 　 　 '; ';.　　 　 　 　 _.._･,..._　　　;
.　　　　　　　　　　 　 ';　':,　　　　ｰ'´-―‐‐ﾞ>'　;'
　　　　　　　　　　　　 }.　 '.;::..　　　 ｀ ￣ ´ 　.,:'
　　　　　　　　　　　　 l　 　ﾞ'..､　 　 　 　 　 ,.:'
　　　　　　　　　　　　ﾉ　　　　｀ﾞ':　,.＿_,..:::::'{
　　　　　　 　 　 ,.r;'´ﾞ-..､_　　　　　　　　　　';、
　　　 _,..　-‐''"´　 ｀ﾞ''‐- ..｀ﾞ''‐- ...　 　 　 　 ::.>- ...、
　　　　　　　　　　　　　 　 ｀ﾞ''‐- ...｀ﾞ''―-''"´　 ,..ｨ' ｀ﾞ''‐-
　　　　　　　　　　　　　　　　　　　｀ﾞ'' ―‐‐ ''"´