After escaping domestic violence and divorcing her abusive husband, Misuzu now lives happily with her kind and caring new husband, Masao. However, she struggles with her relationship with her stepson, Satoru. Satoru gradually opens up to Misuzu, finally calling her "Mom" for the first time. Deeply moved by those words, Misuzu risks everything to help her stepson overcome his troubles—only to face an unexpected and dangerous turn of events. What trial awaits Misuzu as she opens her heart to the son she has come to love?