Yuu Nagami, a high school student aiming to become a light novel author has a little sister named Suzuka. Suzuka is an excellent student with good grades and great looks, but she’s very cold toward her older brother. Every year Yuu keeps failing at the preliminary rounds of the light novel contest, but one day Suzuka reveals a shocking truth. The flirty sibling romantic comedy that Suzuka wrote has won the light novel contest! To make matters worse, Suzuka doesn’t understand anything about light novels or moe so she begs Yuu to stand in for her under her pen-name, Towano Chikai!
Alternative Titles: Ore ga Suki nano wa Imouto dakedo Imouto ja Nai, My Sister, My Writer, The One I Love Is a Little Sister, but She’s Not My Little Sister, 俺が好きなのは妹だけど妹じゃない