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Onii-chan wa Oshimai!
Ab sofort Schwester!
MangaRTLOngoing2017221 chaptersupdated 8d ago
Synopsis
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)  (https://www.melonbooks.co.jp/circle/index.php?circle_id=3753)  (https://ec.toranoana.shop/tora/ec/cot/circle/2UPA116P847KdC6Rd687/all/)  (https://www.dlsite.com/home/circle/profile/=/maker_id/RG40614.html) (jp)
Chapters221 total
ChapterTitlePagesAdded
- 116Mahiro and the Parent-Teacher Conference14Sep 25, 26
- 115Mahiro and the Joys of Creation14Aug 28, 26
- 114Mahiro and the Cosplay Photoshoot14Jul 24, 26
- 113Mahiro and the Ecological Research Duo15Jun 26, 26
- 112.5MAHIRO AND THE SUCCUBUS DRESS7Aug 28, 26
- 112Mahiro and Gender Topsy-Turvy15May 29, 26
- 111.5MAHIRO AND THE SECOND ROUND7Aug 28, 26
- 111Mahiro and the Fun-filled Lion's Den16Apr 24, 26
- 110.7EGG FIRM 10TH ANNIVERSARY BOOK7Sep 15, 26
- 110.6Special booklet for Volume 1122Sep 15, 26
- 110Mahiro and the Demon of the Prefect Council12Mar 27, 26
- 109Mahiro and a Healthy Beauty Regimen14Feb 27, 26
- 108.5A DATE WITH NEMU4Apr 9, 26
- 108Mahiro and Bodyguards14Jan 30, 26
- 107.9Minato-kun is Done For? 326Jan 9, 26
- 107.5MAHIRO AND THE MAKEOVER3Apr 9, 26
- 107Mahiro and Popularity Rankings14Dec 26, 25
- 106Mahiro and Sharing Secrets14Nov 28, 25
- 105Mahiro and an Offline Adventure15Oct 24, 25
- 104.5MAHIRO AND THE MOTHERLY EMBRACE5Apr 9, 26
- 104Mahiro and Mother's Day14Sep 26, 25
- 103Mahiro and Heaven or Hell14Aug 29, 25
- 102.2Aoi-chan Edition6Oct 31, 25
- 102.1Niichi-chan Edition3Oct 31, 25
- 102Mahiro and a Technological Nightmare14Jul 25, 25
- 101.5MAHIRO AND THE FEMALE CHARACTERS6Apr 9, 26
- 101Mahiro and a Celebration14Jun 27, 25
- 100.9Onii-chan's Drawing Bookvol 105Nov 1, 25
- 100.5MAHIRO AND THE CAT ARMY......vol 1013May 30, 26
- 100Mahiro and a Good Day for an Experimentvol 1013May 30, 25
- 99.5Mahiro and Getting a License + Doujin Issue 33 Extrasvol 107Jul 8, 25
- 99Mahiro and the Autobahnvol 1013Apr 25, 25
- 98.5Mahiro and Being a Small Fry Humanvol 102Jul 8, 25
- 98Mahiro and a One-Night Stayvol 1015Mar 28, 25
- 97Mahiro and Crossing the Linevol 1013Feb 21, 25
- 96Mahiro and a Token of Appreciationvol 1014Jan 24, 25
- 95.9Minato-kun is Done For? 2vol 1029Dec 31, 24
- 95.5Miyo and the Datevol 108Feb 28, 25
- 95Mahiro and the University Expedition Squadvol 1014Dec 27, 24
- 94Mahiro and the New School Year, Once Againvol 1016Nov 29, 24
- 93.5The Boys and Another Shotvol 104Jan 10, 25
- 93Mahiro and a Special Treatvol 1013Oct 25, 24
- 92.5Asahi and Growthvol 101Jan 10, 25
- 92Mahiro and a Maiden's Secretvol 1013Sep 27, 24
- 91.5Nemu and Nodokavol 102Jan 10, 25
- 91Mahiro and Marriagevol 1015Aug 30, 24
- 90.9Volume 9 Special Edition Extrasvol 93Oct 18, 24
- 90.8Mahiro and Mama (Revisited)vol 99Oct 18, 24
- 90.5Chapter 90.5vol 96Aug 16, 24
- 90Mahiro and Celebrating Successvol 915Jul 26, 24
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