Collected Works Volume 4

Volume 4 (お兄ちゃんはおしまい!⑩⑪⑫, Onii-chan wa Oshimai!⑩⑪⑫) is the fourth collected works volume of Onimai: I'm Now Your Sister!. It is a compilation of Volume 10, Volume 11, and Volume 12 of the doujinshi with added bonus material. It was originally distributed at New Comic Market 99 on December 31, 2021 before receiving a general release on June 21, 2022.

Bonus Material

 * Character Profiles: Mai Yasaka, Miyako Nagase
 * Afterword