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.