Tankōbon Volume 4

Volume 4 (お兄ちゃんはおしまい!④, Onii-chan wa Oshimai!④) is the fourth tankōbon volume of Onimai: I'm Now Your Sister!. It is a compilation of chapters from Volume 11, Volume 12, Volume 13, and Volume 14 of the doujinshi with added bonus chapters exclusive to this release. It was originally released on July 27, 2020 in Japan, and on January 25, 2022 in North America.