Osananajimi to, Kiss shitakunakunai.

Hiyoko, Ibuki, and Chihiro have been friends since childhood, growing up together as close as siblings. But when they entered high school, that relationship began to change. Chihiro confides in Ibuki about his long-standing crush on Hiyoko. But Hiyoko herself has feelings for Ibuki. What will happen to their relationship?