High schooler Taku Morisaki is approached by his friend Yutaka Matsuno while working in Kouchi city, and urgently summoned to their school. There, Matsuno introduces Taku to Rikako Muto, a gifted yet unpleasant-faced transfer student from Tokyo. Being an introvert, Rikako has only managed to find two friends, Matsuno and a classmate. Taku's life takes an unexpected turn, as a chance encounter during their school trip leads him to become more involved in Rikako's personal affairs, much to Matsuno's chagrin. Torn between his friendship with Matsuno and his own growing romantic interest in Rikako, Taku must confront and unravel his emotions while struggling to understand the magnitude of Rikako's impact on his life, given her troubled past.