Mihana Sumikawa attempts to mediate a quarrel between her superior and his wife, but unintentionally causes the wife's death. Though the incident is ruled an accident and no charges are filed, both Mihana and her husband are consumed by overwhelming guilt. One day, Mihana receives a sudden phone call from her superior. His words—"I want you to take her place"—quietly stir her heart. That single sentence brings a profound change to her life.