Onii-chan wa Oshimai! - Koukou Onimai (Doujinshi) cover

Onii-chan wa Oshimai! - Koukou Onimai (Doujinshi)

Author
Kotobuki (琴吹)
Type
Manga
Status
Ongoing
Year
2023
Genres and tags
Gender Bender Romance Yuri School Life Slice of Life Smut Doujinshi

Description

Without being able to return to being a man, Mahiro Oyama stayed as a girl since middle school and now has become a beautiful high-schooler who gets completely dominated by his first friend since the transformation, Momiji Hozuki, who has gotten really tall and became popular with the girls in their school.

Alternative titles

Chapters (164)

  1. Chapter 153: Miyo-chan's unwavering eyes as she tries her hand at making yuri manga with real people
  2. Chapter 152: Mahiro-chan's habit of cuddling
  3. Chapter 151: Bratty Catgirl fetishes
  4. Chapter 150: Succubus Dress & Mind Break
  5. Chapter 149: Child Chitose and Kind Mahiro
  6. Chapter 148: Final character profiles
  7. Chapter 147: Huge boobs, short haired Mahiro-chan
  8. Chapter 146: Mahiro-chan falls prey to the dangerous onee-san from the research lab
  9. Chapter 145: Thank you. Ch
  10. Chapter 144: Mahiro, who isn't really thinking about being popular.
  11. Chapter 143: Expressing through Art
  12. Chapter 142: HS - Momiji, who ranks number one in the "I want to be held" ranking in her class.
  13. Chapter 141: HS - Asahi growing up in order to become the #1 most huggable girl in the ranking (2)
  14. Chapter 140: Year of the Horse
  15. Chapter 139: HS - Asahi growing up in order to become the #1 most huggable girl in the ranking.
  16. Chapter 138: Sleepover
  17. Chapter 137: Totally wholesome moment between guys
  18. Chapter 136: Totally wholesome sister moment
  19. Chapter 135: Mushroom Growth
  20. Chapter 134: Wet dream after watching a certain movie
  21. Chapter 133: Pocky Game (3)
  22. Chapter 132: Upskirt
  23. Chapter 131: Paralysis
  24. Chapter 130: Ma-hiro Baiser
  25. Chapter 129: Momiji's Birthday Gift
  26. Chapter 128: A manga where JK Momiji feels sensitive to stares
  27. Chapter 127: Papahiro gets cucked by his own son.
  28. Chapter 126: HS - Mommy Genes
  29. Chapter 125: So we're gonna do it right now?!
  30. Chapter 124: Onii-chan wa Oshimai! in a Nutshell
  31. Chapter 123: Domination Loss
  32. Chapter 122: Food-flation
  33. Chapter 121.5: Mahiro-chan, the girl(?) who looks good in summer
  34. Chapter 121: JK Mahiro and Momiji and the porn books from those days (a timeline where he revealed herself as a man)
  35. Chapter 120: "I wanted Mahiro-chan to say that famous line."
  36. Chapter 119: You gettin' raped
  37. Chapter 118: Robo-Mihari Mk. 2
  38. Chapter 117.1: Rabbit Hole
  39. Chapter 117: HS - Changing Sense of Distance
  40. Chapter 116: What if Mahiro-chan continues growing as a girl
  41. Chapter 115: Magical Girl Mahiro (2)
  42. Chapter 114: Minato and Yuuta (2)
  43. Chapter 113: LoveMaster Momiji
  44. Chapter 112: Happy Birthday, Miyo
  45. Chapter 111: Kemonomimi
  46. Chapter 110: Matatabi (2)
  47. Chapter 109: Matatabi
  48. Chapter 108: Asahi x Miyo (8)
  49. Chapter 107: My (Tiny) Dress-Up Bro 2
  50. Chapter 106: My (Tiny) Dress-Up Bro
  51. Chapter 105: Physical Contact (5)
  52. Chapter 104: Dirty Joke
  53. Chapter 103: Golden Week
  54. Chapter 102: 2 Girls, 1 Car (Fetish Warning)
  55. Chapter 101: Immediate Sex
  56. Chapter 100: MomiHiro NTR
  57. Chapter 99: Bratty Mahiro
  58. Chapter 98: Smug Momiji
  59. Chapter 97: Jujutsu Kai-Yuri-sen
  60. Chapter 96: Reversal Play
  61. Chapter 95: EX - "Punishment"
  62. Chapter 94: Pervert
  63. Chapter 93: Drunk Futa (Not-so-SFW)
  64. Chapter 92: Strange Behaviors
  65. Chapter 91: Love Nectar (Very, VERY late Valentines)
  66. Chapter 90: Overdone Incest
  67. Chapter 89: Rammot Mihari
  68. Chapter 88: HS - Setsubun Oni (NSFW?)
  69. Chapter 87: HS - Housewife Mahiro
  70. Chapter 86: Mihari x Kaede (2)
  71. Chapter 85: Mihari x Kaede
  72. Chapter 84: Mahiro's Research Project
  73. Chapter 83: HS - Oyama Claus (2)
  74. Chapter 82.5: HS - Mahiro and her Dress (2)
  75. Chapter 82: Mahiro and her Dress
  76. Chapter 81.8: Mahiro(♂) and Nayuta (3)
  77. Chapter 81.5: Mahiro(♂) and Nayuta (2)
  78. Chapter 81: Mahiro(♂) and Nayuta
  79. Chapter 80.5: HS - Pocky Game (2)
  80. Chapter 80: Reward
  81. Chapter 79.5: Asahi x Miyo (7)
  82. Chapter 79: Asahi's first kiss
  83. Chapter 78: Misleading
  84. Chapter 77: EX - Asahi's breast growth
  85. Chapter 76.5: EX - Big brother
  86. Chapter 76: Lv. 50
  87. Chapter 75.5: EX - Private Lessons
  88. Chapter 75: Newlyweds
  89. Chapter 74: HP Boost
  90. Chapter 73: EX - Change of Clothes
  91. Chapter 72: EX - Shota Mahiro (2)
  92. Chapter 71: Oversized
  93. Chapter 70: Seduction (JK Gyaru Momiji ver.)
  94. Chapter 69.5: EX - Momiji in Wonderland
  95. Chapter 69: (re) Temptation
  96. Chapter 68: EX - Temptation
  97. Chapter 67: EX - Arm wrestling
  98. Chapter 66: EX - Mahiro Crossdressing
  99. Chapter 65: EX - Chest rub
  100. Chapter 64: EX - Sadism

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