ONIMAI - I'm Now Your Sister! cover

ONIMAI - I'm Now Your Sister! — STEP 19 MAHIRO THE STREAMER / STEP 20 MAHIRO AND THE MIDDLE SCHOOLERS / BONUS MIHARI'S WARDROBE / BONUS MIHARI'S WARDROBE AFTERWARDS / AFTERWORD

32 pages, from Official, released Apr 4, 2026.

Volume 2

ONIMAI - I'm Now Your Sister!

Description

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!

Chapters (307)

  1. Chapter 36.9: Mahiro's Weekday Routine + Omnibus 10-11-12 ExtrasVol. 4
  2. Chapter 36.5 - Volume 4Vol. 4
  3. STEP 47 MAHIRO AND THE SUNSHINE GIRL / STEP 47.5 KAEDE'S NICKNAMEVol. 5
  4. Step 36Vol. 4
  5. Chapter 35.6: EX2 Special - I am Mahiro and I am MihariVol. 4
  6. STEP 46 MAHIRO AND THE STICKER COLLECTION / STEP 46.5 MIHARI'S STICKER MEMORIESVol. 5
  7. Step 35Vol. 4
  8. Step 34.5Vol. 4
  9. STEP 44 MAHIRO AND THE BARBECUE SECRET / STEP 45 MAHIRO AND THE SEASONAL ATTIREVol. 5
  10. Step 34Vol. 4
  11. Step 33.5Vol. 4
  12. STEP 43 MAHIRO AND THE PERFUME / STEP 43.5 MAHIRO AND THE FULL-CUP BRAVol. 5
  13. Step 33Vol. 4
  14. Step 32.5Vol. 4
  15. STEP 42 MAHIRO AND THE GIFTED EXPERIENCE / STEP 42.5 MIHARI AND THE STUFFED ANIMALVol. 5
  16. Step 32Vol. 4
  17. STEP 41 MAHIRO AND THE SCHOOL PHYSICAL / STEP 41.3 MAHIRO AND THE HEALTH COMMITTEE / STEP 41.7 MAHIRO AND THE SPANKIESVol. 5
  18. Step 31Vol. 4
  19. STEP 30 MAHIRO RINGS IN THE NEW YEAR / STEP 30.5 MAHIRO AND THE SPICY KISS / BONUS ASAHI AND MOMIJI / AFTERWORDVol. 3
  20. Volume 3Vol. 3
  21. Chapter 30.9: Chapter 21-30 Mini ExtrasVol. 3
  22. Chapter 30.8: Asahi and MomijiVol. 3
  23. Chapter 30.6 - Volume 3Vol. 3
  24. Chapter 30.5 - Volume 3Vol. 3
  25. Step 30Vol. 3
  26. STEP 39 MAHIRO'S BIG SECRET (PART 1) / STEP 40 MAHIRO'S BIG SECRET (PART 2)Vol. 4
  27. Step 29Vol. 3
  28. Chapter 28.1: Mahiro and Girl's Night (Second Part)Vol. 3
  29. STEP 37.5 MIHARI AND THE HIGH SCHOOL GIRLS / STEP 38 MAHIRO'S RELAXING DAY OFF / STEP 38.5 MOMIJI'S MASSAGEVol. 4
  30. Step 28Vol. 3
  31. Chapter 27.99: Omnibus 7-8-9 ExtrasVol. 3
  32. Chapter 27.5 - Volume 3Vol. 3
  33. STEP 36 MAHIRO'S SURPRISE PARTY / STEP 36.5 MAHIRO'S FINAL PRESENT / STEP 37 MAHIRO PRETTIES UPVol. 4
  34. Step 27Vol. 3
  35. Chapter 26.5 - Volume 3Vol. 3
  36. STEP 34.5 PART1 ASAHI'S CREPE / STEP 34.5 PART 2 MAHIRO'S YURI MANGA / STEP 34.5. PART 3 MAHIRO'S "SOMETHING" / STEP 35 MAHIRO AND THE GUIDANCE OF THE STARSVol. 4
  37. Step 26Vol. 3
  38. Chapter 25.6 - Volume 3Vol. 3
  39. Chapter 25.5 - Volume 3Vol. 3
  40. STEP 33.5 MAHIRO AND THE HOMEMADE CHOCOLATE / STEP 34 MAHIRO AND THE ADULTS ONLY SECTIONVol. 4
  41. Step 25Vol. 3
  42. Chapter 24.6 - Volume 3Vol. 3
  43. Chapter 24.5 - Volume 3Vol. 3
  44. STEP 32.5 MAHIRO AND THE MYSTERY BREW / STEP 33 MAHIRO ON VALENTINE'S DAYVol. 4
  45. Step 24Vol. 3
  46. STEP 31 MAHIRO AND THE ALLURE OF BARE LEGS / STEP 32 MAHIRO AND THE UNEXPECTED GUESTSVol. 4
  47. Step 23Vol. 3
  48. Chapter 22.5Vol. 3
  49. Step 22Vol. 3
  50. Chapter 21.7 - Volume 3Vol. 3
  51. Chapter 21.6 - Volume 3Vol. 3
  52. Chapter 21.5 - Volume 3Vol. 3
  53. STEP 28 MAHIRO'S SLEEPOVER (PART 2) / STEP 29 MAHIRO'S DOUBLE DATEVol. 3
  54. STEP 19 MAHIRO THE STREAMER / STEP 20 MAHIRO AND THE MIDDLE SCHOOLERS / BONUS MIHARI'S WARDROBE / BONUS MIHARI'S WARDROBE AFTERWARDS / AFTERWORDVol. 2
  55. Volume 2Vol. 2
  56. Chapter 20.9Vol. 2
  57. Chapter 20.6 - Volume 2Vol. 2
  58. Chapter 20.5 - Volume 2Vol. 2
  59. STEP 27 MAHIRO'S SLEEPOVER (PART 1) / STEP 27.5 MAHIRO'S SIBLING BATHTIMEVol. 3
  60. Step 20Vol. 2
  61. STEP 26 MAHIRO THE PATISSIER / STEP 26.5 MAHIRO'S TWISTED LOGICVol. 3
  62. Step 19Vol. 2
  63. Chapter 18.99: Omnibus 4-5-6 ExtrasVol. 2
  64. Chapter 18.5: Part 1: Mahiro and a "Comrade's" Return & Part 2: Mahiro and PermsVol. 2
  65. STEP 25 MAHIRO'S FINAL EXAMS / STEP 25.5 MAHIRO'S TOUCH / BONUS ASAHI'S INNOCENCEVol. 3
  66. Step 18Vol. 2
  67. STEP 24 MAHIRO AND CONVERSATION / BONUS MAHIRO'S LUNCH / BONUS MIHARI'S LUNCHVol. 3
  68. Step 17Vol. 2
  69. STEP 22 MAHIRO'S DIFFICULT CLASS / STEP 23 MAHIRO'S EXCITING WEEKENDVol. 3
  70. Step 16Vol. 2
  71. Chapter 15.5 - Volume 2Vol. 2
  72. STEP 21 MAHIRO'S FIRST DAY / BONUS MIYO'S REFUSAL / BONUS MOMIJI'S NICKNAME / BONUS KAEDE'S CONCERNVol. 3
  73. Step 15Vol. 2
  74. Step 14Vol. 2
  75. Chapter 13Vol. 2
  76. Chapter 13Vol. 0
  77. Chapter 12.5 - Volume 2Vol. 2
  78. Chapter 12Vol. 2
  79. Chapter 12Vol. 0
  80. Chapter 11Vol. 2
  81. Chapter 11Vol. 0
  82. STEP 10 MAHIRO THE OWN-HOME SECURITY GUARD / STEP 10.5 MAHIRO HELPS OUT / BONUS MIHARI AND HER ONII-CHAN / AFTERWORDVol. 1
  83. Volume 1Vol. 1
  84. Chapter 10.99: Omnibus 1-2-3 ExtrasVol. 1
  85. Chapter 10.9: Chapter 1-10 Mini ExtrasVol. 1
  86. Chapter 10.6 - Volume 1Vol. 1
  87. Chapter 10.5 - Volume 1Vol. 1
  88. STEP 13 MAHIRO'S WHOLESOME PLAYDATE / STEP 14 MAHIRO'S LITTLE ADVENTUREVol. 2
  89. Step 10Vol. 1
  90. Chapter 9.5 - Volume 1Vol. 1
  91. STEP 11 MAHIRO FALLS IN LOVE / STEP 12 MAHIRO'S NIGHT ALONE / STEP 12.5 MAHIRO'S SUNDAY MORNINGVol. 2
  92. Step 9Vol. 1
  93. Chapter 8.5 - Volume 1Vol. 1
  94. Step 8Vol. 1
  95. STEP 9 MAHIRO AND THE GIRLS' DAY OUT / STEP 9.5 MAHIRO AND THE SECRETVol. 1
  96. Chapter 6.5 - Volume 1Vol. 1
  97. STEP 8 MAHIRO STARTS OVER / STEP 8.5 MAHIRO AND THE GACHA GAMEVol. 1
  98. Chapter 5.5 - Volume 1Vol. 1
  99. STEP 6.5 MIHARI'S WASTED EFFORTS / STEP 7 MAHIRO'S UNEXPECTED ENCOUNTERVol. 1
  100. STEP 5.5 MAHIRO, EVEN ON HEAVY DAYS / STEP 6 MAHIRO AND THE SECRET GARDENVol. 1

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