My Friend's Little Sister Has It In for Me!

My Friend's Little Sister Has It In for Me! (友達の妹が俺にだけウザい, Tomodachi no Imōto ga Ore ni Dake Uzai) is Japanese light novel series written by Ghost Mikawa and illustrated by Tomari. A manga adaptation by Hira Hiraoka began serialization online in December 2019, and an anime television series adaptation has been announced in January 2021. Follow the official Twitter page at @imouza_PR.

Plot
If a girl teases you, that means she likes you! Unfortunately, Akiteru knows from experience that isn’t the case. Because every girl he interacts with shows him nothing but scorn, and he’s not scored a single date from it! Luckily, he’s more concerned with securing a spot for him and his game-development buddies at his uncle’s business. But when his uncle throws him a condition that involves playing the part of his daughter’s boyfriend, Akiteru has no choice but to take it. What will his best friend’s sister Iroha, who bullies him relentlessly, think of the news? (J-Novel Club)

Official

 * Light novel official website (in Japanese)