Tomodachi no Imouto ga Ore ni dake Uzai  

My Friends Little Sister Has It in for Me!, My friends sister annoying only me., ImoZa, 友達の妹が俺にだけウザい

I understand that you don't need deep relationships or a romantic partner. You are looking for someone who holds value to you as your friend. Since you have thrown away youth in favor of efficiency, it seems like there is one person who keeps entering your bedroom and causing you annoyance. This person is not your little sister nor your friend but rather an Iroha Kohinata, the little sister of your friend. She tries to seduce you with whatever methods she can play to her advantage, despite being constantly annoying and obnoxious around you. Even though you are busy all day long, she doesn't care. It seems that Iroha is popular at school, an honor student with top grades, and known for being kind and proper to anyone she meets. However, it remains unclear why she only causes annoyance when she is around you.

Tomodachi no Imouto ga Ore ni dake Uzai has been published digitally in English as My Friends Little Sister Has It in for Me! by Square Enix through Manga UP!