ONIMAI: I'm Now Your Sister!
Other titles · Onii-chan wa Oshimai! • Ab sofort Schwester!
- Also known as
- Onii-chan wa Oshimai!
- Also known as
- Ab sofort Schwester!
- Also known as
- お兄ちゃんはおしまい!
- Also known as
- Мій братик вже не братик
- Also known as
- Мой братик теперь не братик!
- Also known as
- 别当欧尼酱了！
- Also known as
- 不当哥哥了！
- Also known as
- Onii-chan Is Done For!
- Also known as
- ONIMAI: Giờ tao là chị mày!
- Also known as
- お兄ちゃんはおしまい！
- Also known as
- Onii-chan is Done For!
- Also known as
- Onii-chan ha Oshimai!
- Also known as
- 오빠는 끝!
by Nekotoufu
222 chapters
Mahiro 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) Official Melon Books Official Toranoana Official DLSite (jp)
Chapters
Chapter 117Mahiro and a Manly JobChapter 116Mahiro and the Parent-Teacher ConferenceChapter 115Mahiro and the Joys of CreationChapter 114Mahiro and the Cosplay PhotoshootChapter 113Mahiro and the Ecological Research DuoChapter 112.5MAHIRO AND THE SUCCUBUS DRESSChapter 112Mahiro and Gender Topsy-TurvyChapter 111.5MAHIRO AND THE SECOND ROUNDChapter 111Mahiro and the Fun-filled Lion's DenChapter 110.7EGG FIRM 10TH ANNIVERSARY BOOKChapter 110.6Special booklet for Volume 11Chapter 110.5MAHIRO AND THE AWARDS CEREMONYChapter 110Mahiro and the Demon of the Prefect CouncilChapter 109Mahiro and a Healthy Beauty RegimenChapter 108.5A DATE WITH NEMUChapter 108Mahiro and BodyguardsChapter 107.9Minato-kun is Done For? 3Chapter 107.5MAHIRO AND THE MAKEOVERChapter 107Mahiro and Popularity RankingsChapter 106Mahiro and Sharing SecretsChapter 105Mahiro and an Offline AdventureChapter 104.5MAHIRO AND THE MOTHERLY EMBRACEChapter 104Mahiro and Mother's DayChapter 103Mahiro and Heaven or HellChapter 102.2Aoi-chan EditionChapter 102.1Niichi-chan EditionChapter 102Mahiro and a Technological NightmareChapter 101.5MAHIRO AND THE FEMALE CHARACTERSChapter 101Mahiro and a CelebrationChapter 100.9Onii-chan's Drawing BookChapter 100.5MAHIRO AND THE CAT ARMY......Chapter 100Mahiro and a Good Day for an ExperimentChapter 99.5Mahiro and Getting a License + Doujin Issue 33 ExtrasChapter 99Mahiro and the AutobahnChapter 98.5Mahiro and Being a Small Fry HumanChapter 98Mahiro and a One-Night StayChapter 97Mahiro and Crossing the LineChapter 96Mahiro and a Token of AppreciationChapter 95.9Minato-kun is Done For? 2Chapter 95.5Miyo and the DateChapter 95Mahiro and the University Expedition SquadChapter 94Mahiro and the New School Year, Once AgainChapter 93.5The Boys and Another ShotChapter 93Mahiro and a Special TreatChapter 92.5Asahi and GrowthChapter 92Mahiro and a Maiden's SecretChapter 91.5Nemu and NodokaChapter 91Mahiro and MarriageChapter 90.9Volume 9 Special Edition ExtrasChapter 90.8Mahiro and Mama (Revisited)Chapter 90.5Chapter 90Mahiro and Celebrating SuccessChapter 89Mahiro and a Home VisitChapter 88.5Chapter 88Mahiro and Romantic AnticsChapter 87Mahiro and Special TechniquesChapter 86.9Minato-kun is Done For? 1.5Chapter 86.5Special: Asahi's BirthdayChapter 86Mahiro and Overflowing Maternal InstinctsChapter 85.6A MEETING OF MOTHERS+ Omnibus 28-29-30 ExtrasChapter 85.5Chapter 85Mahiro and a Stressful Reunion (Part 2)Chapter 84Mahiro and a Stressful Reunion (Part 1)Chapter 83.9Minato-kun is Done For? (Full Version)Chapter 83Mahiro and the New Year's TourChapter 82.5Chapter 82Mahiro and a Silent NightChapter 81.9Minato-kun is Done For? (Preview Version)Chapter 81.8Non-Mahiro Special: Aoi-chan EditionChapter 81.5Chapter 81.5Chapter 81Mahiro and Conflicting ViewsChapter 80.8Mahiro and the Growing Gal Gang + Volume 8 ExtrasChapter 80Mahiro and the Secret EngagementChapter 79Mahiro and the Gal GangChapter 78.9Mihari's Research LabChapter 78.5The Boys and MMORPGsChapter 78Mahiro and MMORPGs RevisitedChapter 77Mahiro and the Farewell PartyChapter 76.9The Research Lab's Mihari-chanChapter 76.1Blu-Ray Box Volume 2 Add-in ComicChapter 76Mahiro and a Close CallChapter 75Mahiro and the Siren's CallChapter 74.99Mihari's Birthday VenueChapter 74.5Everyone and the BlackoutChapter 74.1Blu-Ray Box Volume 1 Add-in ComicChapter 74Mahiro and a Night TogetherChapter 73.5Non-Mahiro Special: Nii-chan EditionChapter 73.1Mahiro-chan's Birthday Venue (2023)Chapter 73Mahiro and Big Bro's SecretsChapter 72.9The Boys Are Done For Too! + Omnibus 22-23-24 ExtrasChapter 72Mahiro and an AdmirationChapter 71.5Mahiro and the Magazine ModelChapter 71Mahiro and the selfie boomChapter 70.9Volume 7 Special BookletChapter 70.8Volume 7 ExtrasChapter 70.7Mahiro and a Discussion on CosplayChapter 70Mahiro and an autumn outingChapter 69.99Nayutan's Birthday VenueChapter 69.5Mahiro and a Moment of GloryChapter 69Mahiro and the Youthful Sports FestivalChapter 68.99Momiji Birthday VenueChapter 68Mahiro and the World of HobbiesChapter 67.99Kaede-chan's birthday venueChapter 67Mahiro and Male PrideChapter 66.5The Boys and Changing ShiftsChapter 66Mahiro and the Tempting Culture Festival (Part 2)Chapter 65Mahiro and the Tempting Culture Festival (Part 1)Chapter 64Mahiro and a Healthy DietChapter 63.99Omnibus 19-20-21 ExtrasChapter 63.5Momiji and PantiesChapter 63Mahiro and Staying Over Because of RainChapter 62.5Nemu and Summer VacationChapter 62.1Mihari-chan's Birthday VenueChapter 62Mahiro and a 2nd Semester DebutChapter 61Mahiro and Summer FestivalChapter 60Mahiro and Summer HomeworkChapter 59Mahiro and spring cleaningChapter 58Mahiro and the Marine Ranger (Part 2)Chapter 57Mahiro and the Marine Ranger (Part 1)Chapter 56Mahiro and The Battle Plan MeetingChapter 55Mahiro and a Summer AdventureChapter 54.9Omnibus 16-17-18 ExtrasChapter 54.7Mahiro and HaremsChapter 54.5Mahiro and the serene mindChapter 54Mahiro and School Ghost StoriesChapter 53.5Boys and GirlsChapter 53Mahiro and the North Wind and SunChapter 52Mahiro and the Little GardenChapter 51Mahiro and Passing the Rainy SeasonChapter 50.5Chapter 50Mahiro and Swim Classes (Part 2)Chapter 49Mahiro and Swim Classes (Part 1)Chapter 48.5MAHIRO AND THE PARENT-TEACHER CONFERENCEChapter 48Mahiro and Class ObservationChapter 47Mahiro and the Sunny GirlChapter 46.5Mihari and Memories of StickersChapter 46Mahiro and Sticker Collecting (fixed)Chapter 45.9Omnibus 13-14-15 ExtrasChapter 45.7Mahiro and Visible UndergarmentsChapter 45Mahiro and the Season for New ClothesChapter 44Mahiro and the Secret BBQChapter 43.5Chapter 43Mahiro and FragrancesChapter 42.6EX3 Special - Mahiro and a Hair's Breadth from Danger!Chapter 42.5[TEMP 1]41.3+41.7 & 42.5 & Mini Extra (2 of 10)Chapter 42Mahiro and the Gift of MemoriesChapter 41Mahiro and the Physical ExaminationChapter 40.99Bonus IllustrationChapter 40.8Mihari and Skipping GradesChapter 40.6Mini Extras [Complete]Chapter 40.5Mahiro and BarefootChapter 40Mahiro and an Important Secret (Part 2)Chapter 39Mahiro and an Important SecretChapter 38.5Momiji and MassagesChapter 38Mahiro and an Appreciated BreakChapter 37.5Mihari and High School GirlsChapter 37Mahiro and a Girl's MannerismsChapter 36.9Mahiro's Weekday Routine + Omnibus 10-11-12 ExtrasChapter 36.5Mahiro and a PresentChapter 36Mahiro and a SurpriseChapter 35.6EX2 Special - I am Mahiro and I am MihariChapter 35Mahiro and the Guidance of FortunesChapter 34.5Chapter 34.5 (1+2+3)Chapter 34Mahiro and the Adult's DoorChapter 33.5Mahiro and HandmadeChapter 33Mahiro and Valentine'sChapter 32.5Mahiro and DrinksChapter 32Mahiro and a Surprise VisitChapter 31Mahiro and Charming Bare LegsChapter 30.9Chapter 21-30 Mini Extras [Complete]Chapter 30.8Asahi and MomijiChapter 30.5Mahiro and Hot KissChapter 30Mahiro and the Coming and Going YearChapter 29Mahiro and a Double DateChapter 28.1Mahiro and Girl's Night (Second Part) [Tank Version]Chapter 28Mahiro and Girl's Night (Second Part) [Pixiv Version]Chapter 27.99Omnibus 7-8-9 ExtrasChapter 27.5Including Extra (25.5 - 26.5 - 27.5)Chapter 27Mahiro and Girl's Night (First Part)Chapter 26Mahiro and PatissierChapter 25Mahiro and FinalsChapter 24.5Part 1: Mahiro and Bento & Part 2: Mihari and BentoChapter 24Mahiro and Common InterestsChapter 23Mahiro and the Fun WeekendChapter 22.5EX Special - Mahiro and an Uneventful HolidayChapter 22Mahiro and the Harsh LessonChapter 21.5ExtrasChapter 21Mahiro and the First Day of School (V2)Chapter 20.9Chapter 11-20 Mini ExtrasChapter 20.5Mihari and Dresses + Mihari (afterwards) and DressesChapter 20Mahiro and Middle Schoolers (v2)Chapter 19Mahiro and Uploading VideosChapter 18.99Omnibus 4-5-6 ExtrasChapter 18.5Part 1: Mahiro and a "Comrade's" Return & Part 2: Mahiro and PermsChapter 18Mahiro and the Onsen Panic (Second Part)Chapter 17Mahiro and the Onsen Panic (First Part)Chapter 16Mahiro and the Hair SalonChapter 15.5Siblings and KotatsuChapter 15Mahiro and Party NightChapter 14Mahiro and a Little AdventureChapter 13Mahiro and a Wholesome RelationshipChapter 12.5Mahiro and NichiasaChapter 12Mahiro and a Lonely NightChapter 11Mahiro and AdventureChapter 10.99Omnibus 1-2-3 ExtrasChapter 10.9Chapter 1-10 Mini ExtrasChapter 10.5Mahiro and Helping Out & OMAKE - Mihari and Onii-chanChapter 10Mahiro and Special Home SecurityChapter 9.5Mahiro and the Two's SecretChapter 9Mahiro and a Girl's VacationChapter 8.5Mahiro and Gacha (v2)Chapter 8Mahiro and New GameChapter 7Mahiro and Encounters with the UnknownChapter 6.5Mahiro and Going in CirclesChapter 6Mahiro and the Secret GardenChapter 5.5Mahiro and Comfort for Many DaysChapter 5Mahiro and a Melancholic DayChapter 4Mahiro and MMORPGChapter 3Mahiro and IdentityChapter 2Mahiro and the Dangerous MirrorChapter 1.5Mahiro and the ToiletChapter 1Mahiro and the Unpleasurable Body