Onii-chan wa Oshimai!
Nekotoufu
ongoing2017GenderswapComedySchool LifeWeb ComicSlice of Life
Start readingMahiro Oyama was just a normal erotic-game loving dude...until he woke up one morning as a woman! Turns out his mad-scientist little sister, Mihari, tried out one of her new experiments on him...with a disastrous outcome, as far as Mahiro's concerned! But Mihari is as determined to study him as he is determined to go back to his shut-in, game-playing life, and one thing's for sure...life is going to get a whole lot weirder from here on out! 5th place of Tsugi Manga Awards, Category Webmanga - Retail: (Direct Retail From the Mangaka)
216 chapters
- Ch. 1Mahiro and the Unpleasurable Bodyunknown group13p
- Ch. 1.5Mahiro and the Toiletunknown group6p
- Ch. 2Mahiro and the Dangerous Mirrorunknown group13p
- Ch. 3Mahiro and Identityunknown group13p
- Ch. 4Mahiro and MMORPGunknown group14p
- Ch. 5Mahiro and a Melancholic Dayunknown group13p
- Ch. 5.5Mahiro and Comfort for Many Daysunknown group4p
- Ch. 6Mahiro and the Secret Gardenunknown group14p
- Ch. 6.5Mahiro and Going in Circlesunknown group4p
- Ch. 7Mahiro and Encounters with the Unknownunknown group15p
- Ch. 8Mahiro and New Gameunknown group17p
- Ch. 8.5Mahiro and Gacha (v2)unknown group11p
- Ch. 9Mahiro and a Girl's Vacationunknown group14p
- Ch. 9.5Mahiro and the Two's Secretunknown group5p
- Ch. 10Mahiro and Special Home Securityunknown group16p
- Ch. 10.5Mahiro and Helping Out & OMAKE - Mihari and Onii-chanunknown group11p
- Ch. 10.9Chapter 1-10 Mini Extrasunknown group19p
- Ch. 10.99Omnibus 1-2-3 Extrasdaily multivitamin10p
- Ch. 11Mahiro and Adventureunknown group15p
- Ch. 12Mahiro and a Lonely Nightunknown group11p
- Ch. 12.5Mahiro and Nichiasaunknown group3p
- Ch. 13Mahiro and a Wholesome Relationshipunknown group15p
- Ch. 14Mahiro and a Little Adventureunknown group14p
- Ch. 15Mahiro and Party Nightunknown group16p
- Ch. 15.5Siblings and Kotatsuunknown group5p
- Ch. 16Mahiro and the Hair Salonunknown group11p
- Ch. 17Mahiro and the Onsen Panic (First Part)unknown group15p
- Ch. 18Mahiro and the Onsen Panic (Second Part)unknown group15p
- Ch. 18.5Part 1: Mahiro and a "Comrade's" Return & Part 2: Mahiro and Permsunknown group5p
- Ch. 18.99Omnibus 4-5-6 Extrasdaily multivitamin12p
- Ch. 19Mahiro and Uploading Videosunknown group10p
- Ch. 20Mahiro and Middle Schoolers (v2)unknown group17p
- Ch. 20.5Mihari and Dresses + Mihari (afterwards) and Dressesunknown group9p
- Ch. 20.9Chapter 11-20 Mini Extrasunknown group17p
- Ch. 21Mahiro and the First Day of School (V2)unknown group15p
- Ch. 21.5Extrasunknown group6p
- Ch. 22Mahiro and the Harsh Lessonunknown group14p
- Ch. 22.5EX Special - Mahiro and an Uneventful Holidayunknown group21p
- Ch. 23Mahiro and the Fun Weekendunknown group9p
- Ch. 24Mahiro and Common Interestsunknown group17p
- Ch. 24.5Part 1: Mahiro and Bento & Part 2: Mihari and Bentounknown group8p
- Ch. 25Mahiro and Finalsunknown group15p
- Ch. 26Mahiro and Patissierunknown group14p
- Ch. 27Mahiro and Girl's Night (First Part)unknown group15p
- Ch. 27.5Including Extra (25.5 - 26.5 - 27.5)unknown group10p
- Ch. 27.99Omnibus 7-8-9 Extrasdaily multivitamin14p
- Ch. 28Mahiro and Girl's Night (Second Part) [Pixiv Version]unknown group18p
- Ch. 28.1Mahiro and Girl's Night (Second Part) [Tank Version]unknown group20p
- Ch. 29Mahiro and a Double Dateunknown group14p
- Ch. 30Mahiro and the Coming and Going Yearunknown group19p
- Ch. 30.5Mahiro and Hot Kissunknown group7p
- Ch. 30.8Asahi and Momijiunknown group9p
- Ch. 30.9Chapter 21-30 Mini Extras [Complete]unknown group21p
- Ch. 31Mahiro and Charming Bare Legsunknown group16p
- Ch. 32Mahiro and a Surprise Visitunknown group14p
- Ch. 32.5Mahiro and Drinksunknown group2p
- Ch. 33Mahiro and Valentine'sunknown group15p
- Ch. 33.5Mahiro and Handmadeunknown group3p
- Ch. 34Mahiro and the Adult's Doorunknown group14p
- Ch. 34.5Chapter 34.5 (1+2+3)unknown group5p
- Ch. 35Mahiro and the Guidance of Fortunesunknown group16p
- Ch. 35.6EX2 Special - I am Mahiro and I am Mihariunknown group22p
- Ch. 36Mahiro and a Surpriseunknown group13p
- Ch. 36.5Mahiro and a Presentunknown group1p
- Ch. 36.9Mahiro's Weekday Routine + Omnibus 10-11-12 Extrasunknown group12p
- Ch. 37Mahiro and a Girl's Mannerismsunknown group18p
- Ch. 37.5Mihari and High School Girlsunknown group3p
- Ch. 38Mahiro and an Appreciated Breakunknown group19p
- Ch. 38.5Momiji and Massagesunknown group2p
- Ch. 39Mahiro and an Important Secretunknown group20p
- Ch. 40Mahiro and an Important Secret (Part 2)unknown group13p
- Ch. 40.5Mahiro and Barefootunknown group2p
- Ch. 40.6Mini Extras [Complete]unknown group11p
- Ch. 40.8Mihari and Skipping Gradesunknown group13p
- Ch. 40.99Bonus Illustrationunknown group10p
- Ch. 41Mahiro and the Physical Examinationunknown group14p
- Ch. 42Mahiro and the Gift of Memoriesunknown group16p
- Ch. 42.5[TEMP 1]41.3+41.7 & 42.5 & Mini Extra (2 of 10)unknown group17p
- Ch. 42.6EX3 Special - Mahiro and a Hair's Breadth from Danger!unknown group21p
- Ch. 43Mahiro and Fragrancesunknown group14p
- Ch. 43.5—unknown group6p
- Ch. 44Mahiro and the Secret BBQunknown group15p
- Ch. 45Mahiro and the Season for New Clothesunknown group13p
- Ch. 45.7Mahiro and Visible Undergarmentsunknown group5p
- Ch. 45.9Omnibus 13-14-15 Extrasunknown group18p
- Ch. 46Mahiro and Sticker Collecting (fixed)unknown group15p
- Ch. 46.5Mihari and Memories of Stickersunknown group3p
- Ch. 47Mahiro and the Sunny Girlunknown group16p
- Ch. 48Mahiro and Class Observationunknown group13p
- Ch. 48.5MAHIRO AND THE PARENT-TEACHER CONFERENCEunknown group5p
- Ch. 49Mahiro and Swim Classes (Part 1)unknown group15p
- Ch. 50Mahiro and Swim Classes (Part 2)unknown group16p
- Ch. 50.5—unknown group4p
- Ch. 51Mahiro and Passing the Rainy Seasonunknown group13p
- Ch. 52Mahiro and the Little Gardenunknown group13p
- Ch. 53Mahiro and the North Wind and Sununknown group14p
- Ch. 53.5Boys and Girlsunknown group3p
- Ch. 54Mahiro and School Ghost Storiesunknown group14p
- Ch. 54.5Mahiro and the serene mindATRScans4p
- Ch. 54.7Mahiro and Haremsunknown group6p
- Ch. 54.9Omnibus 16-17-18 Extrasunknown group18p
- Ch. 55Mahiro and a Summer Adventureunknown group13p
- Ch. 56Mahiro and The Battle Plan Meetingunknown group14p
- Ch. 57Mahiro and the Marine Ranger (Part 1)unknown group33p
- Ch. 58Mahiro and the Marine Ranger (Part 2)unknown group20p
- Ch. 59Mahiro and spring cleaningunknown group15p
- Ch. 60Mahiro and Summer Homeworkunknown group15p
- Ch. 61Mahiro and Summer Festivalunknown group18p
- Ch. 62Mahiro and a 2nd Semester Debutunknown group15p
- Ch. 62.1Mihari-chan's Birthday VenueIchiuzYluu1p
- Ch. 62.5Nemu and Summer Vacationdaily multivitamin4p
- Ch. 63Mahiro and Staying Over Because of Rainunknown group23p
- Ch. 63.5Momiji and Pantiesdaily multivitamin6p
- Ch. 63.99Omnibus 19-20-21 Extrasdaily multivitamin19p
- Ch. 64Mahiro and a Healthy Dietunknown group20p
- Ch. 65Mahiro and the Tempting Culture Festival (Part 1)unknown group19p
- Ch. 66Mahiro and the Tempting Culture Festival (Part 2)unknown group15p
- Ch. 66.5The Boys and Changing Shiftsdaily multivitamin6p
- Ch. 67Mahiro and Male Prideunknown group17p
- Ch. 67.99Kaede-chan's birthday venueunknown group2p
- Ch. 68Mahiro and the World of Hobbiesunknown group14p
- Ch. 68.99Momiji Birthday Venueunknown group2p
- Ch. 69Mahiro and the Youthful Sports Festivalunknown group17p
- Ch. 69.5Mahiro and a Moment of Glorydaily multivitamin7p
- Ch. 69.99Nayutan's Birthday Venueunknown group2p
- Ch. 70Mahiro and an autumn outingunknown group14p
- Ch. 70.7Mahiro and a Discussion on Cosplaydaily multivitamin7p
- Ch. 70.8Volume 7 Extrasdaily multivitamin14p
- Ch. 70.9Volume 7 Special Bookletdaily multivitamin24p
- Ch. 71Mahiro and the selfie boomunknown group14p
- Ch. 71.5Mahiro and the Magazine Modeldaily multivitamin7p
- Ch. 72Mahiro and an Admirationunknown group14p
- Ch. 72.9The Boys Are Done For Too! + Omnibus 22-23-24 Extrasdaily multivitamin18p
- Ch. 73Mahiro and Big Bro's Secrets/a/nonymous14p
- Ch. 73.1Mahiro-chan's Birthday Venue (2023)IchiuzYluu1p
- Ch. 73.5Non-Mahiro Special: Nii-chan EditionMangaDex Scans2p
- Ch. 74Mahiro and a Night Togetherdaily multivitamin13p
- Ch. 74.1Blu-Ray Box Volume 1 Add-in Comicunknown group6p
- Ch. 74.5Everyone and the Blackoutdaily multivitamin6p
- Ch. 74.99Mihari's Birthday Venueunknown group1p
- Ch. 75Mahiro and the Siren's Calldaily multivitamin16p
- Ch. 76Mahiro and a Close Calldaily multivitamin17p
- Ch. 76.1Blu-Ray Box Volume 2 Add-in Comicunknown group6p
- Ch. 76.9The Research Lab's Mihari-chanunknown group7p
- Ch. 77Mahiro and the Farewell Partydaily multivitamin16p
- Ch. 78Mahiro and MMORPGs Revisiteddaily multivitamin15p
- Ch. 78.5The Boys and MMORPGsdaily multivitamin4p
- Ch. 78.9Mihari's Research Labunknown group26p
- Ch. 79Mahiro and the Gal Gangdaily multivitamin15p
- Ch. 80Mahiro and the Secret Engagementdaily multivitamin15p
- Ch. 80.8Mahiro and the Growing Gal Gang + Volume 8 Extrasdaily multivitamin15p
- Ch. 81Mahiro and Conflicting Viewsdaily multivitamin15p
- Ch. 81.5Chapter 81.5daily multivitamin6p
- Ch. 81.8Non-Mahiro Special: Aoi-chan EditionMangaDex Scans5p
- Ch. 81.9Minato-kun is Done For? (Preview Version)daily multivitamin8p
- Ch. 82Mahiro and a Silent Nightdaily multivitamin15p
- Ch. 82.5—daily multivitamin8p
- Ch. 83Mahiro and the New Year's Tourdaily multivitamin15p
- Ch. 83.9Minato-kun is Done For? (Full Version)daily multivitamin32p
- Ch. 84Mahiro and a Stressful Reunion (Part 1)daily multivitamin15p
- Ch. 85Mahiro and a Stressful Reunion (Part 2)daily multivitamin15p
- Ch. 85.5—daily multivitamin8p
- Ch. 86Mahiro and Overflowing Maternal Instinctsdaily multivitamin14p
- Ch. 86.5Special: Asahi's Birthday京都府京都市右京区嵯峨二尊院門前善光寺山町２２6p
- Ch. 86.9Minato-kun is Done For? 1.5daily multivitamin7p
- Ch. 87Mahiro and Special Techniquesdaily multivitamin15p
- Ch. 88Mahiro and Romantic Anticsdaily multivitamin15p
- Ch. 88.5—daily multivitamin1p
- Ch. 89Mahiro and a Home Visitdaily multivitamin16p
- Ch. 90Mahiro and Celebrating Successdaily multivitamin15p
- Ch. 90.5—daily multivitamin6p
- Ch. 90.8Mahiro and Mama (Revisited)daily multivitamin9p
- Ch. 90.9Volume 9 Special Edition Extrasdaily multivitamin3p
- Ch. 91Mahiro and Marriagedaily multivitamin15p
- Ch. 91.5Nemu and Nodokadaily multivitamin2p
- Ch. 92Mahiro and a Maiden's Secretdaily multivitamin13p
- Ch. 92.5Asahi and Growthdaily multivitamin1p
- Ch. 93Mahiro and a Special Treatdaily multivitamin13p
- Ch. 93.5The Boys and Another Shotdaily multivitamin4p
- Ch. 94Mahiro and the New School Year, Once Againdaily multivitamin16p
- Ch. 95Mahiro and the University Expedition Squaddaily multivitamin14p
- Ch. 95.5Miyo and the Datedaily multivitamin8p
- Ch. 95.9Minato-kun is Done For? 2daily multivitamin29p
- Ch. 96Mahiro and a Token of Appreciationdaily multivitamin14p
- Ch. 97Mahiro and Crossing the Linedaily multivitamin13p
- Ch. 98Mahiro and a One-Night Staydaily multivitamin15p
- Ch. 98.5Mahiro and Being a Small Fry Humandaily multivitamin2p
- Ch. 99Mahiro and the Autobahndaily multivitamin13p
- Ch. 99.5Mahiro and Getting a License + Doujin Issue 33 Extrasdaily multivitamin7p
- Ch. 100Mahiro and a Good Day for an Experimentdaily multivitamin13p
- Ch. 100.5MAHIRO AND THE CAT ARMY......Arigato s.a13p
- Ch. 100.9Onii-chan's Drawing Bookunknown group5p
- Ch. 101Mahiro and a Celebrationdaily multivitamin14p
- Ch. 101.5MAHIRO AND THE FEMALE CHARACTERSArigato s.a6p
- Ch. 102Mahiro and a Technological Nightmaredaily multivitamin14p
- Ch. 102.1Niichi-chan Editionunknown group3p
- Ch. 102.2Aoi-chan Editionunknown group6p
- Ch. 103Mahiro and Heaven or Helldaily multivitamin14p
- Ch. 104Mahiro and Mother's Daydaily multivitamin14p
- Ch. 104.5MAHIRO AND THE MOTHERLY EMBRACEArigato s.a5p
- Ch. 105Mahiro and an Offline Adventuredaily multivitamin15p
- Ch. 106Mahiro and Sharing Secretsdaily multivitamin14p
- Ch. 107Mahiro and Popularity Rankingsdaily multivitamin14p
- Ch. 107.5MAHIRO AND THE MAKEOVERArigato s.a3p
- Ch. 107.9Minato-kun is Done For? 3daily multivitamin26p
- Ch. 108Mahiro and Bodyguardsdaily multivitamin14p
- Ch. 108.5 A DATE WITH NEMUArigato s.a4p
- Ch. 109Mahiro and a Healthy Beauty Regimendaily multivitamin14p
- Ch. 110Mahiro and the Demon of the Prefect Councildaily multivitamin12p
- Ch. 111Mahiro and the Fun-filled Lion's Dendaily multivitamin16p
- Ch. 111.5MAHIRO AND THE SECOND ROUNDArigato s.a7p
- Ch. 112Mahiro and Gender Topsy-Turvydaily multivitamin15p
- Ch. 112.5MAHIRO AND THE SUCCUBUS DRESSArigato s.a7p
- Ch. 113Mahiro and the Ecological Research Duodaily multivitamin15p
- Ch. 114Mahiro and the Cosplay Photoshootdaily multivitamin14p
- Ch. 115Mahiro and the Joys of Creationdaily multivitamin14p
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