Oniichan wa Oshimai!

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Chapter 1

Showing 1–50 of 221 chapters

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Chapter 1Mahiro and the Unpleasurable Body
Chapter 1.5Mahiro and the Toilet
Chapter 2Mahiro and the Dangerous Mirror
Chapter 3Mahiro and Identity
Chapter 4Mahiro and MMORPG
Chapter 5Mahiro and a Melancholic Day
Chapter 5.5Mahiro and Comfort for Many Days
Chapter 6Mahiro and the Secret Garden
Chapter 6.5Mahiro and Going in Circles
Chapter 7Mahiro and Encounters with the Unknown
Chapter 8Mahiro and New Game
Chapter 8.5Mahiro and Gacha (v2)
Chapter 9Mahiro and a Girl's Vacation
Chapter 9.5Mahiro and the Two's Secret
Chapter 10Mahiro and Special Home Security
Chapter 10.5Mahiro and Helping Out & OMAKE - Mihari and Onii-chan
Chapter 10.9Chapter 1-10 Mini Extras
Chapter 10.99Omnibus 1-2-3 Extrasdaily multivitamin
Chapter 11Mahiro and Adventure
Chapter 12Mahiro and a Lonely Night
Chapter 12.5Mahiro and Nichiasa
Chapter 13Mahiro and a Wholesome Relationship
Chapter 14Mahiro and a Little Adventure
Chapter 15Mahiro and Party Night
Chapter 15.5Siblings and Kotatsu
Chapter 16Mahiro and the Hair Salon
Chapter 17Mahiro and the Onsen Panic (First Part)
Chapter 18Mahiro and the Onsen Panic (Second Part)
Chapter 18.5Part 1: Mahiro and a "Comrade's" Return & Part 2: Mahiro and Perms
Chapter 18.99Omnibus 4-5-6 Extrasdaily multivitamin
Chapter 19Mahiro and Uploading Videos
Chapter 20Mahiro and Middle Schoolers (v2)
Chapter 20.5Mihari and Dresses + Mihari (afterwards) and Dresses
Chapter 20.9Chapter 11-20 Mini Extras
Chapter 21Mahiro and the First Day of School (V2)
Chapter 21.5Extras
Chapter 22Mahiro and the Harsh Lesson
Chapter 22.5EX Special - Mahiro and an Uneventful Holiday
Chapter 23Mahiro and the Fun Weekend
Chapter 24Mahiro and Common Interests
Chapter 24.5Part 1: Mahiro and Bento & Part 2: Mihari and Bento
Chapter 25Mahiro and Finals
Chapter 26Mahiro and Patissier
Chapter 27Mahiro and Girl's Night (First Part)
Chapter 27.5Including Extra (25.5 - 26.5 - 27.5)
Chapter 27.99Omnibus 7-8-9 Extrasdaily multivitamin
Chapter 28Mahiro and Girl's Night (Second Part) [Pixiv Version]
Chapter 28.1Mahiro and Girl's Night (Second Part) [Tank Version]
Chapter 29Mahiro and a Double Date
Chapter 30Mahiro and the Coming and Going Year

Chapters provided by MangaDex and the scanlation groups credited on each chapter.