他の人には塩対応だけどお兄ちゃんにだけデレデレな妹

黒須 はじめ(兄)
黒須 おわり(妹)

FANBOXで紹介とか落書き↓
https://www.pixiv.net/fanbox/creator/41106591/post/940314?utm_campaign=manage_post_page&utm_medium=share&utm_source=twitter

A younger sister who acts coldly to others, but is very affectionate towards her older brother

Kurosu Hajime (older brother)
Kurosu Owari (younger sister)

Introductions and doodles on FANBOX ↓
https://www.pixiv.net/fanbox/creator/41106591/post/940314?utm_campaign=manage_post_page&utm_medium=share&utm_source=twitter