Yuna Okami is a cute gyaru whose trademark is her silver side ponytail. As the class idol who is kind to everyone, she had long harbored an unrequited love for her childhood friend, Yuya Yamada. Yuya, while aware of those feelings, took them for granted, thinking "Yuna will always love me even if I do nothing," and never tried to progress the relationship. However, the human heart does not stay still forever. Through casual daily chats and comfortable moments with her classmate Guest, Yuna's heart quietly drifts away from the childhood friend who treated her as a convenient backup, steadily leaning toward Guest, who makes her smile. The childhood friend only begins to panic after Yuna's change of heart is "too late," clinging to her with pathetic, naked possessiveness. But by then, the only one reflected in her eyes is Guest—.