Good Night Onii-chan!

Good Night Onii-chan! (お兄ちゃんはおやすみ！, Onii-chan wa Oyasumi!) is a spin-off doujinshi volume of Onimai: I'm Now Your Sister!. It was orginally bundled with the special edition of Tankōbon Volume 7 which was released on January 31, 2023.

Trivia

 * Despite being a part of the Tankōbon subseries, the booklet and its chapters have not recieved an official English translation.

商业版漫画第七卷特装漫画