My Sister, My Writer

is a Japanese light novel series written by Seiji Ebisu and illustrated by Gintarō. A manga adaptation by Kō Narita launched in Monthly Dragon Age in December 2017. An anime adaptation by NAZ and Magia Doraglier premiered on October 10, 2018.

Plot
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 big brother, and the novel wins a light novel award. After they discuss the matter, Yuu, her big brother, is the one who debuts as a proxy light novel author instead of Suzuka under the pen name Towano Chikai (Eternal Promise).