Rina Wakamiya, a newlywed living in a public housing complex, spends her days in loneliness while her husband is away for work. In this neighborhood, aggressive door-to-door salesmen have become a source of constant trouble, spreading anxiety among residents. One day, a visiting salesman sneaks into Rina's apartment, setting a sinister plot into motion that will drastically alter her life. As her ordinary world collapses, a new and intense drama begins to unfold.