Ore ga Suki nano wa Imouto dakedo Imouto ja Nai

Yuu Nagami keeps chasing a writing debut without managing to win a competition. Then his younger sister Suzuka unexpectedly takes a major prize and asks him to appear publicly as the author behind her pen name, Chikai Towano.

Yuu enters the publishing world with a reputation he has not earned through his own manuscripts. Editors, illustrators, and fellow writers complicate the arrangement, while maintaining Suzuka's secret makes every professional encounter a potential trap. He hopes the experience will help his own writing, if he can keep their borrowed identity intact.