Mother Eriko always worried about her introverted son, Ken. Growing up in a single-parent household, he spent most of his time alone, never forming friendships. One day, Ken brought home a friend for the first time. In that moment, Eriko felt an unfamiliar joy swell in her heart. Meanwhile, Ken's friend Yuji was instantly captivated by the sight of Eriko, losing his composure as he became irresistibly drawn to her. A new wind was beginning to blow through Ken's life.