Onii-chan is Done For!

Onii-chan wa Oshimai!; お兄ちゃんはおしまい!; ONIMAI: I'm Now Your Sister!

Author(s): Nekotoufu

Artist(s): Nekotoufu

Type: Manga

Genre(s): Seinen , Genderswap , Comedy , School Life , Web Comic , Slice of Life

Status: Ongoing

Views: 49789

Views rank: 6995/79139

Subscribers rank: 15737/79139

3.29/5 stars (7 votes)

Summary

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://i.imgur.com/0e9KPgq.png) [Official Melon Books](https://www.melonbooks.co.jp/circle/index.php?circle_id=3753) ![](https://i.imgur.com/t9hf4kQ.png) [Official Toranoana](https://ec.toranoana.shop/tora/ec/cot/circle/2UPA116P847KdC6Rd687/all/) ![](https://i.imgur.com/lGJEbPa.png) [Official DLSite](https://www.dlsite.com/home/circle/profile/=/maker_id/RG40614.html) (jp)
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Onii-chan is Done For! Chapters

Name chapter		Date updated
Onii-chan is Done For! Chapter 100: Mahiro and a Good Day for an Experiment		May 31, 2025
Onii-chan is Done For! Chapter 99: Mahiro and the Autobahn		Apr 26, 2025
Onii-chan is Done For! Chapter 98: Mahiro and a One-Night Stay		Mar 29, 2025
Onii-chan is Done For! Chapter 97: Mahiro and Crossing the Line		Feb 22, 2025
Onii-chan is Done For! Chapter 96: Mahiro and a Token of Appreciation		Jan 25, 2025
Onii-chan is Done For! Chapter 95.9: Minato-kun is Done For? 2		Jan 01, 2025
Onii-chan is Done For! Chapter 95.5: Miyo and the Date		Mar 01, 2025
Onii-chan is Done For! Chapter 95: Mahiro and the University Expedition Squad		Dec 28, 2024
Onii-chan is Done For! Chapter 94: Mahiro and the New School Year, Once Again		Nov 30, 2024
Onii-chan is Done For! Chapter 93.5: The Boys and Another Shot		Jan 11, 2025
Onii-chan is Done For! Chapter 93: Mahiro and a Special Treat		Oct 26, 2024
Onii-chan is Done For! Chapter 92.5: Asahi and Growth		Jan 11, 2025
Onii-chan is Done For! Chapter 92: Mahiro and a Maiden's Secret		Sep 28, 2024
Onii-chan is Done For! Chapter 91.5: Nemu and Nodoka		Jan 11, 2025
Onii-chan is Done For! Chapter 91: Mahiro and Marriage		Aug 31, 2024
Onii-chan is Done For! Chapter 90.9: Vol 9 Special Edition Extras		Oct 19, 2024
Onii-chan is Done For! Chapter 90.8: Mahiro and Mama (Revisited)		Oct 19, 2024
Onii-chan is Done For! Vol 9 Chapter 90.5		Aug 17, 2024
Onii-chan is Done For! Chapter 90: Mahiro and Celebrating Success		Jul 27, 2024
Onii-chan is Done For! Chapter 89: Mahiro and a Home Visit		Jun 29, 2024
Onii-chan is Done For! Vol 9 Chapter 88.5		Aug 17, 2024
Onii-chan is Done For! Chapter 88: Mahiro and Romantic Antics		May 25, 2024
Onii-chan is Done For! Chapter 87: Mahiro and Special Techniques		Apr 27, 2024
Onii-chan is Done For! Chapter 86.9: Minato-kun is Done For? 1.5		Apr 10, 2024
Onii-chan is Done For! Chapter 86.5: Special: Asahi's Birthday		Sep 20, 2024
Onii-chan is Done For! Chapter 85.5		Jun 01, 2024
Onii-chan is Done For! Chapter 84: Mahiro and a Stressful Reunion (Part 1)		Jan 27, 2024
Onii-chan is Done For! Chapter 83.9: Minato-kun is Done For? (Full Version)		Jan 07, 2024
Onii-chan is Done For! Chapter 83: Mahiro and the New Year's Tour		Dec 31, 2023
Onii-chan is Done For! Chapter 82		Nov 29, 2023
Onii-chan is Done For! Chapter 81.9: Minato-kun is Done For? (Preview Version)		Nov 11, 2023
Onii-chan is Done For! Chapter 81.5		Jan 02, 2024
Onii-chan is Done For! Chapter 81: Mahiro and Conflicting Views		Oct 28, 2023
Onii-chan is Done For! Chapter 80.8: Mahiro and the Growing Gal Gang + Vol 8 Extras		Dec 09, 2023
Onii-chan is Done For! Chapter 80: Mahiro and the Secret Engagement		Sep 30, 2023
Onii-chan is Done For! Chapter 79: Mahiro and the Gal Gang		Aug 26, 2023
Onii-chan is Done For! Chapter 78.9: Mihari's Research Lab		Aug 16, 2023
Onii-chan is Done For! Chapter 78.5: The Boys and MMORPGs		Aug 14, 2023
Onii-chan is Done For! Chapter 78: Mahiro and MMORPGs Revisited		Jul 29, 2023
Onii-chan is Done For! Chapter 76.9: The Research Lab's Mihari-chan		Jun 04, 2023
Onii-chan is Done For! Chapter 76.1: Blu-Ray Box Vol 2 Add-in Comic		Jun 22, 2023
Onii-chan is Done For! Chapter 76: Mahiro and a Close Call		May 27, 2023
Onii-chan is Done For! Chapter 75: Mahiro and the Siren's Call		Apr 29, 2023
Onii-chan is Done For! Chapter 74.99: Mihari's Birthday Venue		Apr 22, 2023
Onii-chan is Done For! Chapter 74.5: Everyone and the Blackout		May 06, 2023
Onii-chan is Done For! Chapter 74.1: Blu-Ray Box Vol 1 Add-in Comic		Apr 21, 2023
Onii-chan is Done For! Chapter 74: Mahiro and the Two's Night		Mar 25, 2023
Onii-chan is Done For! Chapter 73.1: Mahiro-chan's Birthday Venue (2023)		Apr 12, 2023
Onii-chan is Done For! Chapter 73: Mahiro and Big Bro's Secrets		Mar 20, 2023
Onii-chan is Done For! Vol 8 Chapter 72.9: The Boys Are Done For Too! + Omnibus 22-23-24 Extras		Aug 15, 2024
Onii-chan is Done For! Vol 7 Chapter 72: Mahiro and an Admiration		Feb 20, 2023
Onii-chan is Done For! Chapter 71.5		Mar 29, 2023
Onii-chan is Done For! Vol 7 Chapter 71: Mahiro and the selfie boom		Jan 18, 2023
Onii-chan is Done For! Vol 7 Chapter 70.99: Vol 7 Special Booklet		Apr 07, 2023
Onii-chan is Done For! Vol 7 Chapter 70.9: Vol 7 Extras		Mar 23, 2023
Onii-chan is Done For! Vol 7 Chapter 70.8: Mahiro and a Discussion on Cosplay		Mar 23, 2023
Onii-chan is Done For! Vol 7 Chapter 70: Mahiro and an autumn outing		Dec 13, 2022
Onii-chan is Done For! Vol 7 Chapter 69.99: Nayutan's Birthday Venue		Apr 12, 2023
Onii-chan is Done For! Vol 7 Chapter 69.5: Mahiro and a Moment of Glory		Mar 23, 2023
Onii-chan is Done For! Vol 7 Chapter 69: Mahiro and the Youthful Sports Festival		Nov 14, 2022
Onii-chan is Done For! Vol 7 Chapter 68.99: Momiji Birthday Venue		Apr 12, 2023
Onii-chan is Done For! Vol 7 Chapter 67.99: Kaede-chan's birthday venue		Apr 12, 2023
Onii-chan is Done For! Vol 7 Chapter 67: Mahiro and Male Pride		Sep 11, 2022
Onii-chan is Done For! Vol 7 Chapter 66.5: The Boys and Changing Shifts		Mar 22, 2023
Onii-chan is Done For! Vol 7 Chapter 66: Mahiro and the Tempting Culture Festival (Part 2)		Aug 03, 2022
Onii-chan is Done For! Vol 7 Chapter 65: Mahiro and the Tempting Culture Festival (Part 1)		Jun 29, 2022
Onii-chan is Done For! Vol 7 Chapter 64: Mahiro and a Healthy Diet		Jun 28, 2022
Onii-chan is Done For! Vol 7 Chapter 63.99: Omnibus 19-20-21 Extras		Aug 29, 2023
Onii-chan is Done For! Vol 7 Chapter 63.5: Momiji and Panties		Mar 22, 2023
Onii-chan is Done For! Vol 7 Chapter 63: Mahiro and Staying Over Because of Rain		Apr 30, 2022
Onii-chan is Done For! Vol 7 Chapter 62.5: Nemu and Summer Vacation		Mar 22, 2023
Onii-chan is Done For! Vol 7 Chapter 62.1: Mihari-chan's Birthday Venue		Apr 21, 2023
Onii-chan is Done For! Vol 7 Chapter 62: Mahiro and a 2nd Semester Debut		Mar 28, 2022
Onii-chan is Done For! Vol 7 Chapter 61: Mahiro and Summer Festival		Feb 28, 2022
Onii-chan is Done For! Vol 6 Chapter 60: Mahiro and Summer Homework		Feb 12, 2022
Onii-chan is Done For! Vol 6 Chapter 59: Mahiro and spring cleaning		Jan 28, 2022
Onii-chan is Done For! Vol 6 Chapter 58: Mahiro and the Marine Ranger (Part 2)		Nov 28, 2021
Onii-chan is Done For! Vol 6 Chapter 57: Mahiro and the Marine Ranger (Part 1)		Nov 01, 2021
Onii-chan is Done For! Vol 6 Chapter 56: Mahiro and The Battle Plan Meeting		Nov 01, 2021
Onii-chan is Done For! Vol 6 Chapter 55: Mahiro and a Summer Adventure		Aug 31, 2021
Onii-chan is Done For! Vol 6 Chapter 54.75: Mahiro and Harems		May 17, 2023
Onii-chan is Done For! Vol 6 Chapter 54.9: Omnibus 16-17-18 Extras		May 27, 2023
Onii-chan is Done For! Vol 6 Chapter 54.5: Mahiro and the serene mind		Dec 19, 2023
Onii-chan is Done For! Chapter 54: Mahiro and School Ghost Stories		Jul 27, 2021
Onii-chan is Done For! Vol 6 Chapter 53.5: Boys and Girls		Aug 17, 2021
Onii-chan is Done For! Chapter 53: Mahiro and the North Wind and Sun		Jul 27, 2021
Onii-chan is Done For! Chapter 52: Mahiro and the Little Garden		Jul 27, 2021
Onii-chan is Done For! Chapter 51: Mahiro and Passing the Rainy Season		Jul 27, 2021
Onii-chan is Done For! Chapter 50.5		Jul 27, 2021
Onii-chan is Done For! Chapter 50: Mahiro and Swim Classes (Part 2)		Jul 27, 2021
Onii-chan is Done For! Vol 5 Chapter 49: Mahiro and Swim Classes (Part 1)		Feb 24, 2021
Onii-chan is Done For! Vol 5 Chapter 48.5: MAHIRO AND THE PARENT-TEACHER CONFERENCE		Dec 19, 2023
Onii-chan is Done For! Vol 5 Chapter 48: Mahiro and Class Observation		Feb 17, 2021
Onii-chan is Done For! Vol 5 Chapter 47: Mahiro and the Sunny Girl		Dec 26, 2020
Onii-chan is Done For! Vol 5 Chapter 46.5: Mihari and Memories of Stickers		Aug 05, 2021
Onii-chan is Done For! Vol 5 Chapter 46: Mahiro and Sticker Collecting		Nov 28, 2020
Onii-chan is Done For! Vol 5 Chapter 45.9: Omnibus 13-14-15 Extras		May 26, 2023
Onii-chan is Done For! Vol 5 Chapter 45.7: Mahiro and Visible Undergarments		May 20, 2023
Onii-chan is Done For! Vol 5 Chapter 45: Mahiro and the Season for New Clothes		Nov 09, 2020
Onii-chan is Done For! Vol 5 Chapter 44: Mahiro and the Secret BBQ		Dec 05, 2021
Onii-chan is Done For! Vol 5 Chapter 43.5		Aug 05, 2021
Onii-chan is Done For! Vol 5 Chapter 43: Mahiro and Fragrances		Aug 31, 2020
Onii-chan is Done For! Vol 5 Chapter 42.6: EX3 Special: Mahiro and a Hair's Breadth from Danger!		Aug 31, 2020
Onii-chan is Done For! Vol 5 Chapter 42.5: [TEMP 1]41.3+41.7 & 42.5 & Mini Extra (2 of 10)		Aug 30, 2020
Onii-chan is Done For! Vol 5 Chapter 42: Mahiro and the Gift of Memories		Jul 25, 2020
Onii-chan is Done For! Vol 5 Chapter 41: Mahiro and the Physical Examination		Jun 27, 2020
Onii-chan is Done For! Vol 4 Chapter 40.99: Bonus Illustration		Aug 30, 2020
Onii-chan is Done For! Vol 4 Chapter 40.8: Mihari and Skipping Grades		Aug 30, 2020
Onii-chan is Done For! Vol 4 Chapter 40.6: Mini Extras [Complete]		Aug 29, 2020
Onii-chan is Done For! Vol 4 Chapter 40.5: Mahiro and Barefoot		Aug 29, 2020
Onii-chan is Done For! Vol 4 Chapter 40: Mahiro and an Important Secret (Part 2)		May 24, 2020
Onii-chan is Done For! Vol 4 Chapter 39.5: [TEMP 3]37.5 & 38.5 & Mini Extra (9 of 10)		May 14, 2020
Onii-chan is Done For! Vol 4 Chapter 39: Mahiro and an Important Secret		Apr 25, 2020
Onii-chan is Done For! Vol 4 Chapter 38.5: Momiji and Massages		Aug 29, 2020
Onii-chan is Done For! Vol 4 Chapter 38: Mahiro and an Appreciated Break		Apr 08, 2020
Onii-chan is Done For! Vol 4 Chapter 37.5: [TEMP 2]34.5 & 36.5 & Mini Extra (6 of 10)		Mar 02, 2020
Onii-chan is Done For! Vol 4 Chapter 37: Mahiro and a Girl's Mannerisms		Feb 28, 2020
Onii-chan is Done For! Vol 4 Chapter 36.9: Mahiro's Weekday Routine + Omnibus 10-11-12 Extras		May 26, 2023
Onii-chan is Done For! Vol 4 Chapter 36.5: Mahiro and Present		Aug 29, 2020
Onii-chan is Done For! Vol 4 Chapter 35.5: EX2 Special: I am Mahiro and I am Mihari		Jan 18, 2020
Onii-chan is Done For! Vol 4 Chapter 35.4: [TEMP]32.5 & 33.5 & Mini Extra (3 of 10).zip		Jan 18, 2020
Onii-chan is Done For! Vol 4 Chapter 35: Mahiro and the Guidance of Fortunes		Dec 28, 2019
Onii-chan is Done For! Vol 4 Chapter 34.5: Chapter 34.5 (1+2+3)		Aug 29, 2020
Onii-chan is Done For! Vol 4 Chapter 33.5: Mahiro and Handmade		Aug 29, 2020
Onii-chan is Done For! Vol 4 Chapter 32.5: Mahiro and Drinks		Aug 29, 2020
Onii-chan is Done For! Vol 3 Chapter 30.9: Chapter 21-30 Mini Extras [Complete]		Dec 03, 2019
Onii-chan is Done For! Vol 3 Chapter 30.8: Asahi and Momiji		Dec 02, 2019
Onii-chan is Done For! Vol 3 Chapter 28.1: Mahiro and Girl's Night (Second Part) [Tank Version]		Dec 02, 2019
Onii-chan is Done For! Vol 3 Chapter 27.99: Omnibus 7-8-9 Extras		May 26, 2023
Onii-chan is Done For! Vol 2 Chapter 18.99: Omnibus 4-5-6 Extras		May 21, 2023
Onii-chan is Done For! Vol 1 Chapter 10.99: Omnibus 1-2-3 Extras		May 17, 2023
Onii-chan is Done For! Vol 1 Chapter 1: Mahiro and the Unpleasurable Body		Sep 28, 2024