Source: https://kakuyomu.jp/works/16817330655556357602
Synopsis
Sagami Asahi was a supporting character from the moment he was born. Attractive face and figure, doing well in both academics and sports, high morals–my sister, Sagami Hanabi, who does everything perfectly compared to me, a mob. I’m such a failure, but for some reason I’m very popular with my sister’s friends……! Why is that…..!?
Spending days together with a gentle yandere older sister, a masculine and tsundere boyish senpai, and a straight-forward kuudere senpai, slowly unravels Asahi’s inferiority complex.
AUTHOR: 更科 転
Chapter 1
Sleepover Party
Episode 1 – The Main Character Sister, And The Supporting Character Brother
Episode 2 – Four Princess of The Student Council
Episode 4 – Do You Want to Wash With Me?
Episode 5 – The Feeling in Hands
Episode 6 – Naked Hide and Seek
Episode 10 – Awkward Morning (Zenpen)
Episode 11 – Awkward Morning (Chuuhen)
Episode 12 – Awkward Morning (Kouhen)
School Festival Preparation
Episode 13 – Class Performance
Episode 14 – Couple of Killifish
Episode 17 – At a Family Restaurant
Episode 18 – At a Family Restaurant (Kouhen)
Episode 21 – Script Meeting (Zenpen)
Episode 22 – Script Meeting (Kouhen)
Summer Vacation
Episode 27 – Futaba’s Gratitude