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

Onii-chan wa Oshimai! - Koukou Onimai (Doujinshi) — Chapter 105: Physical Contact (5)

2 pages, from MangaDex, released Jul 7, 2025.

Onii-chan wa Oshimai! - Koukou Onimai (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.

Chapters (165)

  1. Chapter 154: HS - Nurturing and caring for 3 years
  2. Chapter 153: Miyo-chan's unwavering eyes as she tries her hand at making yuri manga with real people
  3. Chapter 152: Mahiro-chan's habit of cuddling
  4. Chapter 151: Bratty Catgirl fetishes
  5. Chapter 150: Succubus Dress & Mind Break
  6. Chapter 149: Child Chitose and Kind Mahiro
  7. Chapter 148: Final character profiles
  8. Chapter 147: Huge boobs, short haired Mahiro-chan
  9. Chapter 146: Mahiro-chan falls prey to the dangerous onee-san from the research lab
  10. Chapter 145: Thank you. Ch
  11. Chapter 144: Mahiro, who isn't really thinking about being popular.
  12. Chapter 143: Expressing through Art
  13. Chapter 142: HS - Momiji, who ranks number one in the "I want to be held" ranking in her class.
  14. Chapter 141: HS - Asahi growing up in order to become the #1 most huggable girl in the ranking (2)
  15. Chapter 140: Year of the Horse
  16. Chapter 139: HS - Asahi growing up in order to become the #1 most huggable girl in the ranking.
  17. Chapter 138: Sleepover
  18. Chapter 137: Totally wholesome moment between guys
  19. Chapter 136: Totally wholesome sister moment
  20. Chapter 135: Mushroom Growth
  21. Chapter 134: Wet dream after watching a certain movie
  22. Chapter 133: Pocky Game (3)
  23. Chapter 132: Upskirt
  24. Chapter 131: Paralysis
  25. Chapter 130: Ma-hiro Baiser
  26. Chapter 129: Momiji's Birthday Gift
  27. Chapter 128: A manga where JK Momiji feels sensitive to stares
  28. Chapter 127: Papahiro gets cucked by his own son.
  29. Chapter 126: HS - Mommy Genes
  30. Chapter 125: So we're gonna do it right now?!
  31. Chapter 124: Onii-chan wa Oshimai! in a Nutshell
  32. Chapter 123: Domination Loss
  33. Chapter 122: Food-flation
  34. Chapter 121.5: Mahiro-chan, the girl(?) who looks good in summer
  35. Chapter 121: JK Mahiro and Momiji and the porn books from those days (a timeline where he revealed herself as a man)
  36. Chapter 120: "I wanted Mahiro-chan to say that famous line."
  37. Chapter 119: You gettin' raped
  38. Chapter 118: Robo-Mihari Mk. 2
  39. Chapter 117.1: Rabbit Hole
  40. Chapter 117: HS - Changing Sense of Distance
  41. Chapter 116: What if Mahiro-chan continues growing as a girl
  42. Chapter 115: Magical Girl Mahiro (2)
  43. Chapter 114: Minato and Yuuta (2)
  44. Chapter 113: LoveMaster Momiji
  45. Chapter 112: Happy Birthday, Miyo
  46. Chapter 111: Kemonomimi
  47. Chapter 110: Matatabi (2)
  48. Chapter 109: Matatabi
  49. Chapter 108: Asahi x Miyo (8)
  50. Chapter 107: My (Tiny) Dress-Up Bro 2
  51. Chapter 106: My (Tiny) Dress-Up Bro
  52. Chapter 105: Physical Contact (5)
  53. Chapter 104: Dirty Joke
  54. Chapter 103: Golden Week
  55. Chapter 102: 2 Girls, 1 Car (Fetish Warning)
  56. Chapter 101: Immediate Sex
  57. Chapter 100: MomiHiro NTR
  58. Chapter 99: Bratty Mahiro
  59. Chapter 98: Smug Momiji
  60. Chapter 97: Jujutsu Kai-Yuri-sen
  61. Chapter 96: Reversal Play
  62. Chapter 95: EX - "Punishment"
  63. Chapter 94: Pervert
  64. Chapter 93: Drunk Futa (Not-so-SFW)
  65. Chapter 92: Strange Behaviors
  66. Chapter 91: Love Nectar (Very, VERY late Valentines)
  67. Chapter 90: Overdone Incest
  68. Chapter 89: Rammot Mihari
  69. Chapter 88: HS - Setsubun Oni (NSFW?)
  70. Chapter 87: HS - Housewife Mahiro
  71. Chapter 86: Mihari x Kaede (2)
  72. Chapter 85: Mihari x Kaede
  73. Chapter 84: Mahiro's Research Project
  74. Chapter 83: HS - Oyama Claus (2)
  75. Chapter 82.5: HS - Mahiro and her Dress (2)
  76. Chapter 82: Mahiro and her Dress
  77. Chapter 81.8: Mahiro(♂) and Nayuta (3)
  78. Chapter 81.5: Mahiro(♂) and Nayuta (2)
  79. Chapter 81: Mahiro(♂) and Nayuta
  80. Chapter 80.5: HS - Pocky Game (2)
  81. Chapter 80: Reward
  82. Chapter 79.5: Asahi x Miyo (7)
  83. Chapter 79: Asahi's first kiss
  84. Chapter 78: Misleading
  85. Chapter 77: EX - Asahi's breast growth
  86. Chapter 76.5: EX - Big brother
  87. Chapter 76: Lv. 50
  88. Chapter 75.5: EX - Private Lessons
  89. Chapter 75: Newlyweds
  90. Chapter 74: HP Boost
  91. Chapter 73: EX - Change of Clothes
  92. Chapter 72: EX - Shota Mahiro (2)
  93. Chapter 71: Oversized
  94. Chapter 70: Seduction (JK Gyaru Momiji ver.)
  95. Chapter 69.5: EX - Momiji in Wonderland
  96. Chapter 69: (re) Temptation
  97. Chapter 68: EX - Temptation
  98. Chapter 67: EX - Arm wrestling
  99. Chapter 66: EX - Mahiro Crossdressing
  100. Chapter 65: EX - Chest rub

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