Imouto wa Kanojo ni Deki Nai no ni

is a Japanese light novel series written by Yukagami, with illustrations by Sonkura. The series began publication on May 10, 2022 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Sakuraba Yukiki is the cutest sister in the world. Although she is a junior high school girl, she is a beautiful girl who looks like a model, her breasts grow perfectly, and she has a good personality. "Let's play the game! Today I'm going to mess with my big brother!" "Fufufu, how about you? I chose the clothes that my big brother seems to like." "Big Brother, let's take a bath together? Sometimes it's good ♪" However, She's still a kid at home. For me, She's a cute little sister forever, and I just enjoy the skinship of my brother and sister. I thought so……. However, one day, the fact of the shock was revealed if we were not real brothers and sisters! My sister couldn't be a girlfriend ... but this is a different story !? No matter what, in the end, a romantic comedy that is "absolutely" tied to my little sister!