Emiri Kasai serves as a maid in the Arimiya household, possessing gray eyes and shoulder-length brown hair. Diligent and committed to her duties, she actively avoids conflict or trouble, a conscientiousness that drives her to work late into the night completing tasks. This role renders her vulnerable, particularly during interactions with Chisato Arimiya. Chisato, who identifies as lesbian, consistently seeks opportunities to sexually assault Emiri, exploiting any minor mistake as justification. Emiri endures this pattern of punishment and exploitation as part of her employment within the household.