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 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 the 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 does not have social media.

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, sparking a 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. 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 because there's not 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 as 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⁾ which has led to several incidents.

• Episode 1
  • TDN (Tadano) - Baseball pitcher. Played the senior 'Miura', acts like a dog. Named TDN Kosugi.
  • DB (Daibō) - Played the junior 'Nakata'. Pulls the 'turning offense' (一転攻勢, itten kousei).
  • HTN (Hatano) - Played the other junior. Mostly a background character.
  • TNOK (Tanioka) - Played the Yakuza member. The main antagonist who gets shot in the ass.
• Episode 2
  • NSOK (Nishioka) - Played the part-timer. Speaks in monotone throughout the episode.
  • DRVS (Darvish) / 'Black' (黒いの) - Played the recruiter/scouter 'Kobayashi'.
  • SBR (Saburō) / 'White' (白いの) - Played the photographer, who ends up on the receiving end.
• Episode 3
  • GO - Played a college student. Best known for playing the charismatic scouter in Episode 1 of Babylon Stage 28, tricking a gas station employee and changing his tone, which sparked the whole “GO is GOD” meme. Countered with “GO is NOT GOD”, “GO is DUST”,¹⁷⁾ and ”SWK is GOD“.
  • Majime-kun (マジメ君) - Played the other college student 'Kono', simply gets videotaped in secret.
• Episode 4
  • Yajuu Senpai (野獣先輩) - Played the senior 'Tadokoro', but mostly known for his other works.
  • Tōno (遠野) - Played the junior 'Tōno'. His iconic scream is dubbed 'Tōno's World' (世界のトオノ).¹⁸⁾
• Miscellaneous
  • Inmu-kun (淫夢くん) - The slow loris mascot (except it's actually a squirrel monkey).¹⁹⁾
  • Houseplant (観葉植物くん, Kanyōshokubutsu-kun) - Specifically, the houseplant in TNOK's office.
  • Cicada (セミ兄貴, Semi-aniki) - After all, it was midsummer.

• MUR (Miura) - Played the bald senior 'Miura'. Best known for his “sōdayo” (そうだよ, lit. “that's right”) line, piggybacking on how Yajuu Senpai noticed that KMR was staring.
• KMR (Kimura) - Played the junior 'Kimura'. Often used as a serious, tsukkomi character to the two.

• SKGC (Sakaguchi) - The Babylon Stage 17 cop, shouts 'keisatsu da' (警察だ, lit. “it's the police”).
• Pinky (ピンキー) - Some generic woman, often paired with a despair 'dededon!' (デデドン！) sound.
• SIY (Seiya) - Played the gas station clerk 'Seiya' in Babylon Stage 28, the episode with GO.
• KBS Trio (KBSトリオ) - The Babylon Stage 30 trio, says “Kane! Boryoku! SEX!” (金！暴力！SEX！).²⁰⁾
• HND△ (Honda-san kakke) - Played the debt collector in Babylon Stage 30.
• SNJ (Shinjo) / FFSNJ - Appears a lot, like Babylon Stage 35. Gets 'fistfucked' in Scooop!!! 5.
• Generic Passerby Geezer (一般通過爺, Ippan Tsūka Jiji) - A random cyclist from Babylon Stage 42.
• AKNM (Akanuma) - Plays the rugby football player in Japan Round 6 and Japan Round 9.
• Miyanaki Michio (宮永通世) - Played a monk in Power Grip 104, dings the '33-4' bell.
• NKTIDKSG (Nekutai Dekasugi) - A man with a large necktie 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) - Played the 'young boy' in Episode 2 of Monzetsu Shonen 5.
  • Hide's OC (ひでのオリキャラ) - A weird, lumpy, heart-shaped frog doodle 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”) - Played the businessman with the bamboo sword in Episode 2 of Monzetsu Shonen 5. He also plays the resident in The Claimer 1.
     • Flowerpot (植木鉢くん, Uekibacki-kun) - The flowerpot in The Claimer 1.
  2. KBTIT (Kubo Taito) / Takuya-san (タクヤさん) - Played the trainer with the iconic fishnet shirt and sunglasses, in Episode 3 of Monzetsu Shonen 5. Says “arigato nasu!” (ありがとナス！).
  3. Hirano Gengoro (平野源五郎) - Played the manager in Episode 3 of Monzetsu Shonen 5. Leads the musketeers. His Twitter account is @acceed_hirano and he actually enjoys Inmu MADs.
• Yuusaku (ゆうさく) - Played 'Daisuke' in Prisoner Daisuke. For some reason, he's often depicted as the hornet who stings himself,²¹⁾ then Nash Music Library's SC-6804 (NSC-SC-6804) plays.

• Dragon Tanaka (ドラゴン田中) - Played a man with the 'big hole' in Kurutta Yajuu-tachi from Tequila Video. His most iconic line is the “WORLD WAR” moan.
• Gaba Hole Daddy (ガバ穴ダディー, Gaba Ana Dadī) - Played the fat, middle-aged teacher who loves anal play in Gaba Hole Daddy from Thunder Video. Mostly known for his weird moans.
• Genba Kantoku (現場監督, lit. “Field Supervisor”) - Played the fat masochist in Kyokon Nikudansen from Samson Video. His most iconic line is the “F.C.O.H.” moan.²²⁾
• Kachō (課長) - No, not that one. Played the 'section chief' in Kachō Kowareru from Samson Video. He would mostly be known for his meowing and moaning.

• In the Inmu community, the term 'harmful rumor' (風評被害, fūhyō higai)²³⁾ 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 been converted into an izakaya called “Nakachan-tei” (中ちゃん亭).
  • “Yajuu House” (野獣邸, Yajū-tei) @ 35.6657°N, 139.6696°E (facing east)²⁴⁾
    The north entrance of Coat Corporation's headquarters, where the “こ↑こ↓” scene was shot.²⁵⁾ It has gathered a lot of attention for the August 10th pilgrimages, which are discouraged.²⁶⁾
• 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 (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]

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