Yurina, a motivated married woman, has been appointed as the head of the neighborhood association. She immediately checks the old accounting books and finds unaccounted funds, so she consults with Tonegawa, a veteran of the neighborhood. Tonegawa knew about the facts but covered them up, so he sends in Hyodo, a young man from the same neighborhood, to silence her. Yurina, who knows nothing about it, is swept away by his momentum and gives in to his body, even though she is married. However, she has no idea that this is the beginning of a nightmare that will befall her.