The October issue of Kadokawa 's Dragon Age magazine published the final chapter of Kō Narita 's manga adaptation of Seiji Ebisu 's Ore ga Suki nano wa Imōto dakedo Imōto ja nai ( My Sister, My Writer ) light novel series on Monday. The manga's fourth compiled book volume will ship in December.

The "awkward sibling romantic comedy" series centers around the younger sister Suzuka Nagami and the older brother Yū Nagami. Suzuka is a beautiful third-year middle school student who has excellent grades and is the student council president. She wrote a novel about a little sister who dotes on her older brother, and the novel wins a light novel award. After they discuss the matter, Yū is the one who debuts as a proxy light novel author instead of Suzuka, under the pen name Chikai Towano.

Narita launched the manga in Dragon Age in December 2017, and Kadokawa published the manga's third volume on May 9.

Ebisu launched the light novel series with illustrator Gintarō in 2016, and Kadokawa published the "8.5th" volume on June 20, with the ninth volume slated for September 20. The novels inspired a television anime adaptation that premiered last October. Crunchyroll streamed the anime as it aired in Japan.