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CHAPTER LIST

Start Reading Newest Chapter

Onii-chan wa Oshimai!

Alternative : お兄ちゃんはおしまい! , ONIMAI: I'm Now Your Sister!
Author(s) : Nekotoufu
Status : Ongoing
Last updated : Jun-05-2026 12:32:28 PM
Genres : Comedy , Slice of Life , Genderswap , School Life , Web Comic

Chapter name Pages Time uploaded

Chapter 112 15 05-29 23:59
Chapter 111 16 04-24 23:57
Chapter 110 12 03-27 23:51
Chapter 109 14 02-27 23:38
Chapter 108.5 4 04-10 01:32
Chapter 108 14 01-31 00:59
Chapter 107.9 26 01-10 00:54
Chapter 107.5 3 04-10 01:32
Chapter 107 14 12-27 00:53
Chapter 106 14 11-29 00:59
Chapter 105 15 10-24 23:53
Chapter 104.5 5 04-10 01:32
Chapter 104 14 09-26 22:59
Chapter 103 14 08-30 00:00
Chapter 102.2 6 10-31 16:58
Chapter 102.1 3 10-31 16:58
Chapter 102 14 07-25 23:57
Chapter 101.5 6 04-10 01:31
Chapter 101 14 06-27 23:58
Volume 10
Chapter 100.9 5 11-01 04:34
Chapter 100.5 13 05-30 14:18
Chapter 100 13 05-30 23:58
Chapter 99.5 7 07-08 09:39
Chapter 99 13 04-25 23:59
Chapter 98.5 2 07-08 09:36
Chapter 98 15 03-28 23:54
Chapter 97 13 02-22 00:59
Chapter 96 14 01-25 01:00
Chapter 95.9 29 01-01 01:10
Chapter 95.5 8 03-01 00:58
Chapter 95 14 12-28 00:58
Chapter 94 16 11-30 01:29
Chapter 93.5 4 01-11 01:34
Chapter 93 13 10-26 00:04
Chapter 92.5 1 01-11 01:33
Chapter 92 13 09-27 23:56
Chapter 91.5 2 01-11 01:32
Chapter 91 15 08-31 00:35
Volume 9
Chapter 90.9 3 10-19 00:03
Chapter 90.8 9 10-19 00:00
Chapter 90.5 6 08-16 23:23
Chapter 90 15 07-27 00:00
Chapter 89 16 06-29 00:05
Chapter 88.5 1 08-16 23:22
Chapter 88 15 05-24 23:44
Chapter 87 15 04-26 23:44
Chapter 86.9 7 04-10 11:00
Chapter 86.5 6 09-20 04:31
Chapter 86 14 03-29 23:48
Chapter 85.5 8 05-31 17:43
Chapter 85 15 02-24 00:45
Chapter 84 15 01-27 00:42
Chapter 83.9 32 01-06 23:19
Chapter 83 15 12-31 11:29
Chapter 82.5 8 03-02 01:01
Chapter 82 15 11-25 01:07
Chapter 81.9 8 11-11 01:56
Chapter 81.8 5 11-04 14:16
Chapter 81.5 6 01-02 11:36
Chapter 81 15 10-28 00:08
Volume 8
Chapter 80.8 15 12-09 00:59
Chapter 80 15 09-30 02:10
Chapter 79 15 08-26 00:02
Chapter 78.9 26 08-15 22:24
Chapter 78.5 4 08-14 01:08
Chapter 78 15 07-29 00:09
Chapter 77 16 06-24 00:10
Chapter 76.9 7 06-04 12:44
Chapter 76.1 6 06-22 08:30
Chapter 76 17 05-27 01:16
Chapter 75 16 04-29 07:32
Chapter 74.99 1 04-21 19:13
Chapter 74.5 6 05-05 22:20
Chapter 74.1 6 04-20 20:23
Chapter 74 13 07-05 09:58
Chapter 73.5 2 11-06 19:18
Chapter 73.1 1 04-11 19:11
Chapter 73 14 03-20 12:58
Chapter 72.9 18 08-15 00:00
Chapter 72 14 02-20 13:36
Chapter 71.5 7 03-29 01:35
Chapter 71 14 01-18 14:16
Volume 7
Chapter 70.9 24 04-07 00:55
Chapter 70.8 14 03-23 00:53
Chapter 70.7 7 03-23 00:51
Chapter 70 14 12-13 14:34
Chapter 69.99 2 04-11 13:41
Chapter 69.5 7 03-22 17:54
Chapter 69 17 11-14 15:02
Chapter 68.99 2 04-11 13:41
Chapter 68 14 10-19 14:19
Chapter 67.99 2 04-11 13:41
Chapter 67 17 09-11 12:06
Chapter 66.5 6 03-22 04:30
Chapter 66 15 08-03 14:24
Chapter 65 19 06-29 08:51
Chapter 64 20 06-28 03:47
Chapter 63.99 19 08-28 23:03
Chapter 63.5 6 03-22 04:24
Chapter 63 23 04-30 13:50
Chapter 62.5 4 03-22 04:21
Chapter 62.1 1 04-11 22:11
Chapter 62 15 03-27 23:28
Chapter 61 18 02-28 06:52
Volume 6
Chapter 60 15 02-12 14:54
Chapter 59 15 01-28 07:41
Chapter 58 20 11-27 23:50
Chapter 57 33 10-31 19:34
Chapter 56 14 10-12 20:33
Chapter 55 13 08-30 16:53
Chapter 54.9 18 05-27 10:55
Chapter 54.7 6 05-17 07:56
Chapter 54.5 4 12-17 12:23
Chapter 54 14 07-26 20:07
Chapter 53.5 3 08-16 22:32
Chapter 53 14 07-07 20:54
Chapter 52 13 07-07 20:52
Chapter 51 13 07-07 20:20
Volume 5
Chapter 50.5 4 07-07 21:07
Chapter 50 16 07-07 23:19
Chapter 49 15 02-24 19:53
Chapter 48.5 5 12-19 02:00
Chapter 48 13 02-17 18:49
Chapter 47 16 12-27 00:40
Chapter 46.5 3 08-05 06:34
Chapter 46 15 11-28 22:13
Chapter 45.9 18 05-25 22:54
Chapter 45.7 5 05-20 07:30
Chapter 45 13 11-09 07:31
Chapter 44 15 10-05 03:34
Chapter 43.5 6 08-05 06:33
Chapter 43 14 08-31 22:42
Chapter 42.6 21 08-31 07:18
Chapter 42.5 17 08-30 19:36
Chapter 42 16 07-26 00:13
Chapter 41 14 06-27 17:59
Volume 4
Chapter 40.99 10 08-30 19:47
Chapter 40.8 13 08-30 06:40
Chapter 40.6 11 08-30 03:47
Chapter 40.5 2 08-30 02:39
Chapter 40 13 05-24 20:19
Chapter 39 20 04-25 19:32
Chapter 38.5 2 08-30 02:38
Chapter 38 19 04-09 03:26
Chapter 37.5 3 08-30 02:37
Chapter 37 18 02-28 23:00
Chapter 36.9 12 05-25 22:35
Chapter 36.5 1 08-30 02:31
Chapter 36 13 01-29 16:09
Chapter 35.6 22 01-19 00:48
Chapter 35 16 12-29 00:45
Chapter 34.5 5 08-30 02:29
Chapter 34 14 12-01 10:08
Chapter 33.5 3 08-30 02:27
Chapter 33 15 10-29 10:29
Chapter 32.5 2 08-30 02:25
Chapter 32 14 09-28 17:23
Chapter 31 16 09-28 09:21
Volume 3
Chapter 30.9 21 12-03 07:00
Chapter 30.8 9 12-03 05:30
Chapter 30.5 7 08-08 05:51
Chapter 30 19 07-31 23:55
Chapter 29 14 06-29 23:36
Chapter 28.1 20 12-03 01:38
Chapter 28 18 05-28 19:53
Chapter 27.99 14 05-25 22:30
Chapter 27.5 10 05-26 16:06
Chapter 27 15 04-27 20:59
Chapter 26 14 03-31 21:52
Chapter 25 15 02-27 09:51
Chapter 24.5 8 05-26 10:53
Chapter 24 17 02-01 07:04
Chapter 23 9 12-30 15:28
Chapter 22.5 21 05-26 07:06
Chapter 22 14 11-26 00:18
Chapter 21.5 6 05-25 18:11
Chapter 21 15 10-31 11:34
Volume 2
Chapter 20.9 17 05-24 19:19
Chapter 20.5 9 05-25 14:45
Chapter 20 17 10-04 09:08
Chapter 19 10 08-31 11:50
Chapter 18.99 12 05-20 21:34
Chapter 18.5 5 05-25 11:44
Chapter 18 15 07-30 14:48
Chapter 17 15 07-07 02:42
Chapter 16 11 05-27 02:19
Chapter 15.5 5 05-25 01:08
Chapter 15 16 04-30 09:19
Chapter 14 14 04-03 04:16
Chapter 13 15 03-01 08:44
Chapter 12.5 3 05-24 22:26
Chapter 12 11 02-04 16:57
Chapter 11 15 02-04 16:54
Volume 1
Chapter 10.99 10 05-17 09:26
Chapter 10.9 19 05-24 13:26
Chapter 10.5 11 07-21 09:07
Chapter 10 16 02-03 00:07
Chapter 9.5 5 07-21 09:03
Chapter 9 14 02-03 00:05
Chapter 8.5 11 02-06 21:40

Onii-chan wa Oshimai! 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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Philosophical	Psychological	Romance
Sci-Fi	Slice of Life	Sports
Superhero	Thriller	Tragedy
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Alternative : お兄ちゃんはおしまい! , ONIMAI: I'm Now Your Sister!