In an elementary school located in a community marked by extreme disparities in wealth, a mother of twins named Yuki no Shiraishi experiences a sudden and devastating fall from her life as a socialite following the death of her husband, who worked for the board of education. Consumed by a desire to clear her late husband's name and uncover the truth behind the incident that led to their ruin, Yuki no resolves to use her own body as a weapon to get close to the PTA, an organization she believes holds the key to the conspiracy. She transfers her children to a public school where she begins to infiltrate the PTA, methodically using her physical appeal to seduce and manipulate those in positions of power, including the school principal, in order to gather clues.

Yuki no Shirazi is the central protagonist, a widowed mother of twins whose attractive figure becomes both her primary tool for revenge and a source of moral conflict as she finds herself increasingly unable to resist the physical pleasures that come with her schemes. The narrative follows her dangerous game of revenge, where she aims to expose the darkness lurking within the school's hierarchy while struggling against her own growing desires. A supporting character named Tachibana eventually provides Yuki no with assistance, helping her draw closer to achieving her goal of vengeance against those responsible for her husband's death. The manga progresses through distinct narrative arcs, beginning with her sudden fall from grace and her decision to approach the PTA by any means necessary. As the story develops, Yuki no successfully enters the PTA and methodically entices multiple authority figures, culminating in a plan to organize a children's cafeteria event that brings her into contact with a specific target. In the final stages of the published story, Yuki no continues to grapple with her conflicting feelings of revenge and pleasure while working alongside Tachibana, only to face unforeseen developments just as she believes she has gained complete control of the situation.