Neechan no Tomodachi ga Uzai Hanashi: A Story about Nao Misumi and Sena Ikuta 1

[Machine Translation] The best friend's younger brother and the sister's best friend have a relationship that can't be left alone. The series includes the interesting continuation of the serialization and an extra chapter newly drawn! ( synopsis ) Hisashi Misumi, a first year high school student, has known Sena Ikuta, the best friend of his older sister Rio, since they were in elementary school. As a big sister, Sena has always been familiar and annoying to Hisashi, but he cannot help disliking her for her constant concern not only for Rio but also for himself. She is stupid, no-nonsense, has a buggy sense of distance from people, and is also insensitive. It's just supposed to be a troublesome and helpless emotion. 'I definitely didn't like her at first. I was noisy and would take things that were important to other people. I'm not sure why..." I feel depressed about her calling me her brother, but I can't leave her alone somehow...?

親友の弟×姉ちゃんの親友ふたりは、ほっとけない関係SNSで話題沸騰の年の差胸キュンシリーズ!!連載の気になる続きと番外編を描き下ろし収録！【あらすじ】高校1年生の三澄尚は小学生の頃から、姉の莉緒の親友・生田瀬那と知り合い。お姉ちゃんっ子だった尚にとって、瀬那はいつも馴れ馴れしくてうざいけど、莉緒だけでなく自分のこともずっと気にかけてくる彼女を嫌いにはなれなかった。バカで、能天気で、人との距離感がバグっているし、あと鈍感。ただただ面倒でどうしようもない感情のはずなのに。「最初は間違いなく嫌いだった。うるさいし、人の大事なもん取るし。それが、どうして――」自分のことを弟呼びする彼女を鬱陶しく感じながらも、どこかほっとけない存在で…？