Collected Works Volume 6

Volume 6 (お兄ちゃんはおしまい!⑯⑰⑱, Onii-chan wa Oshimai!⑯⑰⑱) is the sixth collected works volume of Onimai: I'm Now Your Sister!. It is a compilation of Volume 16, Volume 17, and Volume 18 of the doujinshi with added bonus material. It was originally distributed at Comic Market 101 on December 31, 2022 before receiving a general release on January 30, 2023.

Bonus Material

 * Bonus character drawings
 * Bonus Drawings: Mahiro next to Asahi, Asahi in a dress next to Kaede in her work attire, Yu Ōka next to Kasumi Hozuki, Mari Nishinomiya next to Yomi Murosaki, Mahiro in her school bathing suit, Rin Minakata in the school bathing suit with and without a jacket, Kaede next to Mahiro,
 * Afterword