Tankōbon Volume 3

Volume 3 (お兄ちゃんはおしまい!③, Onii-chan wa Oshimai!③) is the third tankōbon volume of Onimai: I'm Now Your Sister!. It is a compilation of chapters from Volume 7, Volume 8, Volume 9, and Volume 10 of the doujinshi with added bonus chapters exclusive to this release. It was originally released on September 27, 2019 in Japan, and on November 30, 2021 in North America.

Trivia
商业版漫画第三卷
 * The English language release of the four parts of Chapter 21.5 classifies them instead as special chapters. Also, Part 2 is ordered between Chapter 25.5 and Chapter 26.
 * The English language release of the two parts of Chapter 24.5 classifies them instead as bonus chapters.