Io Asuka takes on the role of a maid at a hot spring inn left behind by her deceased mother, striving to carry on the family legacy. However, a sinister conspiracy lurks within the inn, aimed at destroying her. The people around her exploit her vulnerabilities, relentlessly pressuring and cornering her. Gradually, Io is driven to the brink of mental collapse, her anguish and inner turmoil portrayed in intense dramatic detail.