Mihari and Her Onii-Chan

Mihari and Her Onii-Chan (みはりちゃんとお兄ちゃん, Mihari chanto o nīchan) is a bonus chapter of Onimai: I'm Now Your Sister. It was originally published exclusively in Volume 1 of the manga which was released on June 27, 2018 in Japan, and August 31, 2021 in the US.

Summary
Mihari recalls discussing with Kaede in middle school about wanting a younger sister, and in the present day reflects on how much things have changed since she began her experiment with Miharo.

Characters

 * Mahiro Oyama
 * Mihari Oyama
 * Kaede Hozuki